It is a comprehensive subject to study the earthquake hazardous area zoning in Tianzhu.

研究天祝地震危险区划是一个综合性的课题.

The reliability of Ex hauling equipment is closely linked to the safety in explosive hazardous area.

防爆搬运设备的防爆安全性与爆炸危险场所的工作安全息息相关.