垫圈表面的标准光洁度最大为125- 200百万分之一英寸粗糙度。
Standard finish of gasket surface is 125-200 micro-inch maximum roughness.
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。
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.
病毒很难被发现，其中一个原因是因为他们都很微小——通常只有百万分之一英寸大小。
One reason that viruses can be so hard to find is that they're so small - typically a few millionths of an inch across.
一英寸的百万分之一是极小的长度。
一英寸的百万分之一是极小的长度。
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