因此，接触导线高度测量具有重大的意义。

Therefore, the height measurement of contact wire is significant.

youdao

当你使这两条导线一接触，这台机器就会立刻开始运转。

When you contact these two wires, the machine will start at once.

youdao

当你使这两条导线一接触，这台机器就会立刻开始运转。

When you contact these two wires, the machine will start at once.

youdao