求翻译：4. Inspect the sight glass which is located on the side of the oil tank. The surface of the oil should be between the red and blue lines.是什么意思？

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悬赏分：1 - 离问题结束还有

4. Inspect the sight glass which is located on the side of the oil tank. The surface of the oil should be between the red and blue lines.

问题补充：

匿名	2013-05-23 12:21:38 4。这是位于油箱侧面检查视镜。油面之间应该是红色和蓝色的线条。

匿名	2013-05-23 12:23:18 4。检查油位观察孔的一侧,位于油箱内。表面上的油应该在的红、蓝线。

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38 4.检查那些地处油箱的视线玻璃。油的表面应之间的红色和蓝色的线条。

匿名	2013-05-23 12:28:18

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