horizontal part

例句：

1. 1. The car's horizontal part is where the engine sits.
   汽车的水平部分是发动机所在的位置。
2. 2. The engineer measured the length of the horizontal part of the beam.
   工程师测量了梁的水平部分的长度。
3. 3. The construction worker was working on the horizontal part of the roof.
   建筑工人正在屋顶的水平部分工作。