求翻译：在机器后侧机头的墙板上装上光幕发射器3，在机尾的墙板上装上光幕接收器4。机器后侧的光幕接收器4和发射器3体积比较大。是什么意思？

The light curtain emitter 3 on the handpiece wallboard tops of the rear of the machine, the tail of the wallboard installed on the light curtain receiver 4. The light curtain receiver 4 and transmitter 3 volume of the rear side of the machine is relatively large.

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Installs the light curtain launcher in on the machine rear end nose wall plate 3, installs the light curtain receiver on the airplane tail wall plate 4.The machine rear end light curtain receiver 4 and the launcher 3 volumes quite are big.

In the back of the machine head put glazing curtain wall plate transmitter 3, tail put glazing curtain wall plate receiver 4. Machine back 4 the light curtain receiver and transmitter 3 volume is relatively large.

正在翻译，请等待...