为了打开房间内所有的灯，去每一个空间拉灯绳是必要的。

To turn on all the lights in a room, it is necessary to go to each place and pull the strings.

youdao

为了打开房间内所有的灯，去每一个空间拉灯绳是必要的。

To turn on all the lights in a room, it is necessary to go to each place and pull the strings.

youdao