half-life

half-life

美 　英

• n.半衰期；（放射性物質的）半衰期
• 網絡半條命；戰栗時空；半生期

詞形變化

復數：half-lives  

英漢雙解

英漢解釋

na.	1. 【核】半衰期〔放射性同位素分裂[從生物體中排出]一半量的時間〔也作 half life 或 half life period〕〕

英英解釋

n.	1. the amount of time that is needed for a substance to lose one half of its radioactivity

例句

But the half-life of market domination seems to be dwindling.

但是似乎這些公司的壟斷半衰期一直在縮短。

It accumulates in the cooling water of nuclear reactors and is often vented in small amounts to the environment. Its half-life is 12 years.

氚聚集在核反應堆的冷卻水中，通常以微量排放到環境中，其半衰期為12年。

When Hazen's team put oil samples in a laboratory setup designed to mimic Gulf conditions, it had a half-life of between one and six days.

當黒曾團隊將油樣放入模擬的海灣背景下的實驗室，油樣有一個在一天和六天之間的半衰期。

"Half-Life 2" , which came out in 2004, took six years to develop, whereas new episodes can be put together in a year or so.

2004年發行的《半條命2》花費了六年時間開發，而游戲的新章節僅需一年左右就可完工。

In particular, the half-life of ethyl mercury is short (less than 1 week) compared with that of methyl mercury (1. 5 Months).

特別是乙基汞的半衰期較短（少于1周），而甲基汞的半衰期為1.5個月。

Furthermore, the long half-life of the metabolites could cause their accumulation and induce apparent injuries of target organs.

而且，此代謝物的半衰期極長。故極易累積于體內造成標的器官明顯的傷害。

Iodine-131 has a half-life of about a week, meaning that levels in water could fall quickly if new doses aren't introduced.

碘-131的半衰期在一個星期左右，所以如果沒有新的劑量進入，水中的放射性可能就會很快下降。

Scientists estimate the half-life of CO2 might be close to a hundred years.

科學家估計，二氧化碳的半衰期可能接近于100年。

Iodine-131 has a half-life of roughly a week, which means levels could fade if new radioactive material isn't added.

碘-131的半衰期約為一周，也就是說如果沒有新的放射性物質加入，輻射水平有望降低。

Half-life is the time required for half the quantity of the protein to be broken down and eliminated from the joint space.

半衰期指一半蛋白從關節腔中分解和消失用的時間。

Such a short half-life to facilitate the treatment of the operation, but also easy to play a role in radioactive antibody.

如此短的半衰期便于治療操作，也便于放射性抗體發揮作用。

This half life of technical skills is without parallel in any other industry.

技能的日新月異是其它任何行業都無法相提并論的。

Near my home in a small yard , as if there is a small half-life is necessary to bloom .

在我家附近的一間小破屋子里，仿佛半有一個小生命就要綻開，卻又含苞欲放。

So, it become one of important tasks of recombined peptides drugs reconstruction to prevent degradation rapidly and prolong half-life of.

防止多肽在體內迅速降解、延長半衰期成為蛋白質工程藥物改造的重要課題之一。

Their half-life in the body is estimated to be seven to eleven years.

它們在體內的半衰期估計為7至11年。

With a 30-year half-life, dangerous amounts can remain for years in pasture that might be grazed by livestock.

因為銫-137的半衰期長達30年，所以放牧牲畜的牧場可能會持續幾年都含有危險劑量的輻射。

Half-Life showed us very well that you could add a deep story into a game and the player would be thrilled to play it.

Half-Life很好的向我們展示了你可以再游戲中添加深刻的故事，玩家會玩的很激動。

Cesium-134 is considered somewhat less of a long-term problem because it has a half-life of two years.

銫134被認為影響沒有那么長久，因為它的半衰期是兩年。

The compositions and methods are useful for modulating the plasma circulation half-life of an active agent.

這些組合物和方法可有效調節活性藥物的血漿循環半衰期。

Very long half-life of plutonium, will enter the body with breathing a high likelihood of cancer.

钚的半衰期非常長，隨呼吸進入人體后會致癌的可能性極高。

Old masons thinking along while, he thought he worked hard, more than half life soon have burn up.

老石匠思索了半天，他想到自己辛苦操勞了多半輩子，生命很快就有燃盡了。

L-dopa prodrug AEPD is able to increase the bioavailability and lengthen the half life of L-dopa.

將左旋多巴利用前藥原理修飾成乙酰左旋多巴乙酯能夠顯著提高左旋多巴的生物利用度和延長左旋多巴的半衰期。

By contrast, the half-life of a cordless phone for the home is measured in years.

相反，家用無繩電話的使用期卻是有些年頭的。

Over the long term, the big threat to human health is cesium-137, which has a half-life of 30 years.

長期以來，對人體健康的一大威脅就是銫137，它的半衰期為三十年。

The danger of nitrogen-16 is an issue only for plant workers and operators because its half-life is only seven seconds.

氮-16只對電廠的工人和操作人員存在危險，因為它的半衰期只有七秒中。

Cesium-137, with a half-life of 30 years, is another dangerous substance emitted in a full-scale nuclear meltdown.

核反應堆完全熔解后，會釋放出另一種危險物質銫-137。銫-137的半衰期為30年。

Besides, the also has such advantages as long half-life, and little influence of environment to the immobilized system.

同時與其它酶固定化方法相比較，具有半衰期長，固定化體系受外界環境影響小等特點。

Currently, PEGylation is commonly used as an effective method to prolong its half-life in serum.

聚乙二醇修飾是目前有效地延長其半衰期的方法。

Half-life (elimination) is the time required for the plasma drug concentration or the amount of drug in the body to decrease by 50%.

半衰期（消除）是指血漿藥物濃度或體內藥物數量降低50%時所需的時間。

Obviously the gaming selection is still a little limited here, but Half-Life 2 and Portal 2 played full-res without a hitch.

顯然游戲選擇仍然有些限制，但是半條命2和傳送門2全開沒有任何延遲。

The city's challenge, chiefly, is to dispose of cesium-137, a radioactive isotope with a half-life of 30 years.

這座城市面臨的最大問題就是處理銫—137，這是一種半衰期為30年的放射性同位素。

taking stable iodine as a pill blocks the uptake of the hazardous radioisotope, which has a half-life of 8 days.

服用穩定的碘元素會阻止危險碘同位素的攝入，碘同位素的半衰期僅為八天。

Half-life is the time it takes one-half of the atoms of a radioactive material to disintegrate.

半衰期是指放射性物質的原子有半數發生衰變時所需要的時間。

One of the first tunnels. Probably, the first Half-Life video game was created on the base of the one of such objects.

首批隧道之一。大概第一部“半條命”電視游戲是以一個這樣的場所為基地設計的。

As a result, a polymer with a appropriate Mw as well as a neutral charge can possess a long half-life in plasma.

所以分子量大于3萬，且為中性電荷的聚合物在血漿內半衰期長。

But the half-life of these fake packages has been getting shorter.

但是，這些“偽”方案的半衰期變得越來越短。

Half-life: the number of radioactive nuclei decay and reduced by half the time required for the initial value.

半衰期：放射性原子核的數量因衰變而減少為初始值一半所需的時間。

Iodine-131 has a half-life of eight days and is quite dangerous to human health.

碘131的半衰期為八天，對人體健康損害十分巨大。

The time it takes for half of its original amount to decay is called the half-life.

衰變至只剩下原來數目一半所需的時間稱為該核素的半衰期。

For all this, these compound existence's half-life is short.

盡管如此，這些化合物存在的半衰期非常短。