Teapot general can burn deep in the mud and the mud layer thickness ranging from tens of centimeters to one meter under the rock.

可以烧制紫砂壶的泥一般深藏于岩石层下且，泥层厚度从几十厘米至一米不等。

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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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Each of these seven layers is of a different, precisely defined thickness, ranging from 13 to 688 nanometres (or billionths of a metre).

这七层，每层都是不一样的，准确地说，厚度是不同的，厚度从13到688纳米不等(一纳米为一米的十亿分之一)。

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