necessity-no

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n. 需要；必然性；必需品

1
The non-contact switch is used to provide a double life in which there is no necessity to replace the item often.
非接触式开关可实现双倍使用寿命，无需频繁更换该部件。
2
He has the power to choose, but no power to escape the necessity of choice.
他有选择的能力，但没有逃避选择的必要性的能力。
3
The recount is a practical necessity but has no basis in electoral law.
重新计票有实际的必要性，却无选举法作为法律基础。

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