When the sand has finished falling, you have to turn the sand glasses over.

当沙子落完的时候，你必须把沙漏翻过来。

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The landscape fell away, revealing a seemingly infinite vista of rippled sand mounds, rising and falling like the folds in a quilt.

这里视野开阔，看到的是无边无际起伏的沙丘，像被子上的褶皱。

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It USES a thin stream of falling sand to measure time.

它使用一小股落下的沙子来计算时间。

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Earth is bombarded with more than 100 tons of dust and sand-sized particles every day, much of it falling into the oceans or remote areas, and otherwise going unnoticed.

WSJ: Meteorite Hits Russia, Causing Panic

She did not tell anyone that she spent much of her time looking out at the Pacific from empty beaches, some of them narrow with coarse sand, though farther north many of the beaches were rocky, desolate in the falling dusk, when seagulls circled hungrily and waves deposited dead seaweed.

NEWYORKER: Alone