I'll give you a key so that you can let yourself in.
我把鑰匙給你，你可以自己開門進(jìn)去。
The key is hanging on a string by the door.
鑰匙拴在門邊的帶子上。
The need to communicate is a key characteristic of human society.
需要交流是人類社會(huì)最重要的一個(gè)特征。
Cost was a key element in our decision.
價(jià)錢是我們決策時(shí)考慮的主要因素。
Good communication is key to our success.
良好的溝通是我們成功的關(guān)鍵。