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conj. 当...的时候
ad. 何时, 什么时候
pron. 什么时侯
n. 时间

hardly...when... scarcely ...when scarcely...when hardly when even when say when when one's clock strikes if and when return when done when hell freezes over when pigs fly when dissected when permitted when awake when issued when radiographed even when hardly when no matter when... when pigs fly acceptability when radiographed when first diagnosed