There's lighting inside the case and sight window on the outside door, convenient for observation.

两个玻璃观察窗位于给料机进口端（端门），用于观察胶带运行状况。

youdao

There's lighting inside the case and sight window on the outside door, convenient for observation.

两个玻璃观察窗位于给料机进口端（端门），用于观察胶带运行状况。

youdao