seat beam

例句：

1. 1.The engineer carefully measured the length of the seat beam before installing it.
   工程师在安装之前仔细测量了座椅横梁的长度。
2. 2.The carpenter used a saw to cut the seat beam for the new seats.
   木匠用锯子切割座椅横梁来制作新座椅。
3. 3. The weight of the beam was too heavy for the old car, so they had to replace it with a new one.
   旧车的重量太重，以至于他们不得不用新的来替换它。