bird's-mouth
美
英 
例句
Now use a small, soft-edged brush to get rid of the object in the bird's mouth.
用一個小一點的軟筆刷清除鳥嘴處的東西。
In bird banding work, the band must be put on first before measuring the bird's mouth, wings, head, and so forth.
上網的鳥帶回室內,要先上腳環,再測量鳥的嘴長、翼長和全頭長等。
What is smaller than a humming-bird's mouth?
什么比蜂鳥的嘴小?