词汇	safety objective
释义	safety objective 安全目标
随便看	the past several days the past several months the past several weeks the past several years the past simple the past six days the past six months the past six weeks the past six years the past ten days the past ten months the past tense the past ten weeks the past ten years The path of civilization is paved with tin cans the path of development The path of duty is the path of safety the past thirty years the past three days the past three months the past three weeks the past three years the past times the past two days the past two decades