What is one grain of sand in the desert?

什么是沙漠中的一粒沙？

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A wise man once said: spend a day, a world in one grain of sand.

有一位智者曾经说过：一花一天国，一沙一世界。

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One grain of sand cannot avalanche, but pile up enough grains of sand and you get a dune that can trigger avalanches.

一粒沙子不能引起沙丘的崩塌，但是一旦堆积了足够多的沙子，就会出现一个沙丘，进而也就能引发一场沙崩。

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Such nanotechnology involves engineering carbon-based polymer molecules, one-millionth the size of a grain of sand, that attach to fibers to wick away moisture and resist stains, water and static.

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