What a strange device, similar to a big microphone? Maybe for sponging planes?

多么奇怪的设备，类似于一个大的麦克风？也许是用来擦拭飞机的？

youdao

What a strange device, similar to a big microphone? Maybe for sponging planes?

多么奇怪的设备，类似于一个大的麦克风？也许是用来擦拭飞机的？

youdao