twinned groove

例句：

1. 1. The twinned grooves on the surface of the stone are intricate and beautiful.
   石头表面的双生沟槽复杂而美丽。
2. 2.The engineer designed a twinned groove to reduce friction between the moving parts.
   工程师设计了一个双生沟槽，以减少移动部件之间的摩擦。
3. 3. The twinned grooves in this machine are crucial for its smooth operation.
   这种机器中的双生沟槽对于其平稳运行至关重要。