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safety rule
auto.	安全规定规则，法规
met.	安全条例
oil	安全规则
tech.	安全规章; 安全规程
safety rule A principle or regulation governing actions, procedures or devices intended to lower the occurrence or risk of injury, loss and danger to persons, property or the environment
environ.	安全规则 (为了降低伤害对人、财产或环境的损失和危险的发生率或风险，而用原则或规定规范一些相关活动、过程或设备。)

safety rule : 5 phrases in 4 subjects

Aviation	1
Electronics	1
Space	1
Technology	2