Some rocks from volcanoes break down to form black sand.

有些火山岩被撞碎后会形成黑色的沙。

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They tried to break the icy sand with their knives, but it was not easy.

他们试图用他们的刀，打破在冰冷的沙滩，但这并不容易。

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They tried to break the icy sand with their knives, but it was not easy.

他们试图用他们的刀，打破在冰冷的沙滩，但这并不容易。

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