所以，一个60毫米直径的卵石。

So, a sixty millimetre diameter pebble.

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纳米晶体，也被称为量子点，是一种直径只有百万分之一毫米的半导体粒子。

Nanocrystals, also known as quantum dots, are semiconducting particles with a diameter of a few millionths of a millimeter.

youdao

声学纤维最令人叹为观止的是其直径只有1.1毫米。

What is so remarkable about these fibres is that they are only 1.1 millimetres in diameter.

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