protective-[医] 保护疗法protectiveadj.保护的；防卫的protective retention保护保持率protective operation防护性军事行动protective greenbelt防护绿地protective condenser保护电容器protective spark gap保护火花隙protective committee[经] 保护性委员会protective grounding保护接地protective influence保护性影响protective spectacle护目镜protective time slot保护时段