conj. if ; in case
倘使你一定要知道的话，这是我男朋友给的。
It's from my boyfriend, if you must know.
《牛津词典》
倘使你有许多业余时间，你会怎样利用它？
If you had unlimited leisure time, how would you spend that time?
youdao
倘使他在这儿，他就会向我们展现该如何做了。
If he were here: he would show us how to do it.
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