CHUCK: ma 'am, I work as a roof repairman.
查克：夫人，我是一名屋顶修理工。
And work on the structure that will eventually support its roof is underway.
而用来最终支撑屋顶的钢架构的搭建工程也在进行中。
The roof slice longwall method increases the work of laying false roof for next slice.
长壁采煤法的采煤工艺具有多重特点：顶分层采煤增加了要为下分层填设假顶的工作。
The roof slice longwall method increases the work of laying false roof for next slice.
长壁采煤法的采煤工艺具有多重特点：顶分层采煤增加了要为下分层填设假顶的工作。
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