necessity是什么意思

　　This is, of necessity, a brief and incomplete account.

　　這必然是一份簡(jiǎn)略的、不完全的描述。

　　We recognize the necessity for a written agreement.

　　我們認(rèn)為有必要簽訂一份書(shū)面協(xié)議。

　　We were discussing the necessity of employing more staff.

　　我們?cè)谟懻撌欠裥枰�雇用更多員工。

　　Air-conditioning is an absolute necessity in this climate.

　　這樣的氣候絕對(duì)需要有空調(diào)。

　　Water is a basic necessity of life.

　　生命離不開(kāi)水。