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Describing something as necessary with 必要 (bìyào)
Obligation & Necessity
Structure
不 + 必要 + 的 + Noun / 必要 + 的 + Noun
Explanation
必要 (bìyào) means "necessary" or "essential," used to describe something that is required or indispensable. It can be negated with 不 to mean "unnecessary." For example, 不必要的危险 means "unnecessary danger."
Examples
学外语的时候，每天练习是很必要的。
Xué wàiyǔ de shíhòu, měi tiān liànxí shì hěn bìyào de.
When learning a foreign language, daily practice is very necessary.
你觉得带伞有必要吗？天气预报说不下雨。
Nǐ juéde dài sǎn yǒu bìyào ma? Tiānqì yùbào shuō bù xià yǔ.
Do you think it's necessary to bring an umbrella? The forecast says no rain.
这些不必要的花费应该减少。
Zhèxiē bù bìyào de huāfèi yīnggāi jiǎnshǎo.
These unnecessary expenses should be reduced.