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

一克沙子不能引沙丘的崩塌，但是一旦积累了足够称为沙丘数量的这么多沙子就当然能引发沙丘的崩塌。

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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.

一克沙子不能引沙丘的崩塌，但是一旦积累了足够称为沙丘数量的这么多沙子就当然能引发沙丘的崩塌。

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