He had learned to read the millionths of an inch on the micrometer and to shape the grinding wheel with an instrument set with a diamond.
他学会了在千分尺上辨识一百万分之一英寸，会用镶嵌着金刚石的工具制作砂轮。
Micrometer: An instrument used to measure accurately small distance, thickness, etc. To the nearest 1000th inch or cm.
千分尺：用于精确测量小长度，厚度等的一种仪器，其精确程度达至千分之一寸或厘米。
The micrometer, which is also called a clock gauge, is a measuring instrument which is more precise than a common ruler.
分厘卡又叫千分表， 是一种远比尺子精度高的长度度量工具。
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