smooth constraint

例句：

1. 1. The engineer used a smooth constraint to hold the structure together.
   工程师使用一个光滑的约束来固定结构。
2. 2. The smooth constraint made it easy for the team to work together.
   这个光滑的约束让团队能够轻松地合作。
3. 3. The smooth constraint helped the machine run more efficiently.
   这个光滑的约束帮助机器运行得更加高效。