roofers
英['ruːfərz] 美['ruːfərz]
roofers also ranked poorly because of their hazardous working conditions.
屋顶工排名较低的另一个原因是他们危险的工作环境。
After September 11th, they volunteered their best roofers to help repair the Pentagon.
911之后，他们曾志愿用最好的屋顶材料帮助修复五角大楼。
Trade certification for residential steep roofers is available, but voluntary, in British Columbia.
在不列颠哥伦比亚省，住宅陡峭屋顶工行业认证是可用的，但是自愿的。
