security protection distance

• 安全防护距离

security protection distance的用法和样例：

例句

1. The discharge of uncontrollable ammonia was determined by the antiinferenee of ground consistency.A practical and feasible health protection zone was determined.
   采用地面浓度反推法，计算出氨的无组织排放量，从而确定出可行的大型氮肥厂卫生防护距离。