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it is vital meaning it is of vital importance例句 is it vital to or vital in when something is vital what is vital means is vital to do还是doing be of vital importance造句 what is the definition vital 

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it is...that...造句 it is told that造句 it is logical to think that造句 it is vital for sb to do造句 用it is vital that造句 it is/was not until that造句 it is side that造句 it is vital to do造句 it is certain that造句 用 it is that 造句 

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