在流量指示器上安装一个盖子固定螺丝，便以打开进入。

Single cover retaining screw mounted on top of the indicator for easy access.

youdao

在流量指示器上安装一个盖子固定螺丝，便以打开进入。

Single cover retaining screw mounted on top of the indicator for easy access.

youdao