hazardous material transportation

例句：

1. 1. The company's main businessis the hazardous material transportation.
   该公司的主要业务是危险物质运输。
2. 2. The hazardous material transportation was carriedout in strict accordance with safetyregulations.
   危险物质运输严格遵循安全规定进行。
3. 3. The hazardous material transportation should behandled by professionals only.
   危险物质运输应由专业人员处理。