The elements are contained in layers of mud ranging in thickness from 2 meters to 70 meters that have accumulated on seabeds 3, 500 meters to 6, 000 meters deep.

在3500至6000米深的海床上，蓄积着2到70米厚的海底淤泥层，稀土元素就储藏这些泥层里。

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As a result, the makers have developed a generation of cells whose silicon layers are only a micron or two deep, as opposed to the usual thickness of 200-300 microns.

因此，制造商开发出了新一代的电池，这种电池的硅层厚度只有一至二微米，而不是通常200 - 300微米的厚度。

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The thickness of layers reveals how much snow accumulated in a year.

冰层的厚度显示一年中降了多少雪。

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As a result, the makers have developed a generation of cells whose silicon layers are only a micron or two deep, as opposed to the usual thickness of 200-300 microns.

ECONOMIST: Solar energy