protection net防御网protectionn.保护；防卫protection of natural circumstances保护自然环境protection of over electric current过电流保护protectionh of ecologic environment生态系统保护protection against electrical shock电击防护protection of environment resources环境资源保护protection of maritime defence line海上防线保卫protection of serviceman rs marriage军婚保护protection of ecological environment生态环境保护protection by traveling wavedistance行波距离保护protection equipment for transformer变压器保护装置

1. Take sartorius as an example, there should be protective covers to its upper and lower conveyer belts.
   例如缝纫机车需要安装上下皮带保护罩。