flat ruler

• 直尺

flat ruler的用法和样例：

例句

1. The child used a ruler to draw straight lines.
   这孩子用一把直尺划直线。
2. Use the ruler and the feeler to inspect whether the joint surface of the cylinder head is deformed.
   利用直尺和塞尺检查气缸头的结合面是否有变形。