This is, of necessity, a brief and incomplete account.
這必然是一份簡略的、不完全的描述。
We recognize the necessity for a written agreement.
我們認為有必要簽訂一份書面協議。
We were discussing the necessity of employing more staff.
我們在討論是否需要雇用更多員工。
Air-conditioning is an absolute necessity in this climate.
這樣的氣候絕對需要有空調。
Water is a basic necessity of life.
生命離不開水。