secondary activity

美 　英

• 網(wǎng)絡(luò)第二級活動；次級活性；第二活性

例句

The service design is usually a secondary activity, although it is sometimes done in parallel.

服務(wù)設(shè)計常常是次要的活動，盡管有時候并行地完成。

My question is: Why was official business discharged as a secondary activity formerly? And what is the primary activity?

為什么從前的機(jī)關(guān)事務(wù)是作為次要工作執(zhí)行的？那首要的工作是什么呢？