基本解释

• [交通运输工程]左半圆

英汉例句

双语例句

• Observation eyepiece consists of concave mirror and a separate gate is formed, in the eyepiece can be seen at the same time the two semicircle color, its left for the sample color.
  观察目镜由凹镜和分隔栅组成，在目镜中可同时看到二个半圆色，其左边的为试样颜色。
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专业释义

交通运输工程

• 左半圆