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假如你不知道, 你就要问。用英语怎么说？

假如你不知道, 你就要问。

If you don't know, you must ask.

相关词汇
if you know must ask

if

conj. 如果，倘若，即使，〈口〉是否，假设；n. 条件，设想；

you

pron. 你，你们，您们，各位，大家；

know

v. 知道，了解，认识，确信；n. 知情；

must

aux. 必须，必然要，（做出逻辑推断），（表示坚持）；n. 必须做的事，必不可少的事物，葡萄汁，霉臭，麝香；vt.& vi. （表示必要或很重要）必须，（提出建议）应该，得，（表示很可能或符合逻辑）一定；adj. 不可或缺的，狂暴的；

ask

vt.& vi. 问，询问，需要，要求，请求，邀请；vt. 邀请，请求允许，要价，询问；vi. 请，邀请，询问，要求；
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