plain flange

例句：

1. 1. The new machine has a plain flange that can be easily adjusted for different sizes.
   这台新机器有一个可以轻易调整以适应不同大小的平缘法兰。
2. 2. The construction of the bridge required the use of a plain flange to ensure structural integrity.
   建造这座桥需要使用平缘法兰以确保结构完整性。
3. 3. The engineer carefully measured the dimensions of the plain flange before assembling the parts.
   工程师仔细测量了平缘法兰的尺寸，然后组装零件。