It was no way to live never knowing when one of these storms would break.

这样的日子可怎么熬？总是担惊受怕，不知道什么时候这样的暴风雨又会袭来。

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As a result, Aunt Pitty was chronically in what Uncle Peter called a "state," never knowing when her bedroom would be entered by an officer and a squad of men.

这样，皮蒂姑妈便经常处于彼得大叔所谓的“过分紧张”之中，不知道什么时候自己的卧室里会闯入一个军官和一帮子大兵。

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You never know when circumstances will change, and it's worth knowing how to behave in these cases.

您永远不会知道情况什么时候会变化，了解如何处理各种情况是值得的。

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She hates never knowing when a real estate agent might call wanting to bring a prospective buyer to see the house.

NPR: Subprime Crisis Makes It Maddening to Sell a House

In the past, Moretti, a veteran of three other entrepreneurial ventures, would raise one large venture round, never knowing when hed need capital.

FORBES: Going Into Hock

In the classic tradition of never knowing when too much was just that, the Maserati brothers always had a slight problem with racing: They were addicted to it.

FORBES: Vehicles Feature