Ash particles are normally in the 50-100 micron ( 0.05 to 0.1 millimetre ) range .

灰粒大小通常在50-100微米（0.05到0.1毫米）之间。

This provides an up-to-date and accurate measurement ( to within a tenth of a millimetre ) of a pipe 's thicknesses .

这样，就能得到实时、准确（精度控制在十分之一毫米内）的管壁厚度数据了。

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

纳米晶体（也被称为量子点）是一些半导体粒子，其直径为几百万分之一毫米。

These contain millions of transistors in a square millimetre and are at present made in silicon-fabrication plants costing $ 10 billion or more .

芯片包括在1平方毫米的成百万晶体管，而且目前用硅制造设备花费为100亿美元或者更多。

Dr post 's cultures , grown from stem cells , are sheets 3cm long , 1.5cm wide and half a millimetre deep .

波斯特博士利用干细胞培养成的东西是一些长3公分、宽1.5公分，大约半毫米厚的薄片。