At last they got to the point of installing the roof beam.
最后，工程进行到安装屋顶大梁这一紧要步骤了。
The unit simply fits into the bottom two channels of the roof beam.
简单地安装到本机底部的两个梁渠道。
He said, My friends, we cannot use fresh green wood to make the roof beam.
他说：朋友们，新鲜的木材来不能用来制造，它会变弯并下陷的。
The roof was supported by a comparatively traditional post-and-beam system.
建筑屋顶由相对传统的后梁系统支撑。
He directed the tiny beam of light at the roof.
他把那一小束光对准了屋顶。
He directed the tiny beam of light at the roof.
他把那一小束光对准了屋顶。
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