词典释义：
idiom 时光流逝；时间不多了；时日无多；时间快到了
The sands are running out, we must have the money by tomorrow.
剩下的时间不多了，我们明天得弄到这笔钱。
The sands of time are running out for the central star of this hourglass-shaped planetary nebula.
在这一酷似沙漏形状的星云内，“时间之沙”即将从中央星之中流逝殆尽。
The sands of his life are fast running out.
他的生命很快将走到尽头。
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