The fear is that, at current consumption rates, that underground bunker will be empty within 20 years, leaving the earth almost helium-free by the end of the 21st century.

我们担心的是，按照现在的消耗速度，那个地下储存库将在20年内枯竭，而在21世纪末留给地球的将几乎都是游离氦。

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The fear is that, at current consumption rates, that underground bunker will be empty within 20 years, leaving the earth almost helium-free by the end of the 21st century.

我们担心的是，按照现在的消耗速度，那个地下储存库将在20年内枯竭，而在21世纪末留给地球的将几乎都是游离氦。

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