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