n.需要；必需品；必然

Necessity is the mother of invention. 需要是發(fā)明之母。

Want and necessity break faiths and oaths. 匱乏和需要可以打破信仰和誓言。

Water is of vital necessity in the desert. 在沙漠地區(qū)水是維持生命的必需品。

Food is a necessity, but wine is an extravagance. 食物是必需品,而酒則是奢侈品。

That men would die was a matter of necessity; which men would die, though, was a matter of circumstance. 人總有一死，這是必然的事，不過(guò)哪些人死，這是偶然的事。