如果你遇到过这样的情况，你就会知道在你的包里或车里始终放一本书是多么明智的选择，你永远都无法预知自己什么时候会遇到需要消磨时间的情况。
If so, you should know that it is wise to keep a book in your purse or car at all times, as you never know when you'll find yourself with some time to kill.
如果股市继续上涨的话，观望者们中间的绝大多数会投身其中，因此，你可能永远都无法知道这一反弹会持续到什么时候和高度。
If the market keeps on going up, more of them may decide to join in. You never know how far the rally goes.
如果股市继续上涨的话，观望者们中间的绝大多数会投身其中，因此，你可能永远都无法知道这一反弹会持续到什么时候和高度。
If the market keeps on going up, more of them may decide to join in. You never know how far the rally goes.
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