unit length

例句：

1. 1.The engineer measured the length of the beam to ensure it was within the required specifications.
   工程师测量了梁的长度，以确保它符合规定的规格。
2. 2. The company uses a standardized unit length for all its products.
   该公司使用标准化的单位长度来生产所有产品。
3. 3. The construction worker used a tape measure to measure the length of the wall before starting the renovation.
   建筑工人使用卷尺测量墙壁的长度，然后开始装修。