piston diameter at ring lands

例句：

1. 1. The piston diameter at thering land is crucial for engine performance.
   活塞直径在环带处对发动机性能至关重要。
2. 2.During the manufacturing process, the pistondiameter at the ring land must be preciselymeasured.
   在制造过程中，必须精确测量活塞直径在环带处。
3. 3. The pistondiameter at the ring land affects fuel efficiencyand emissions levels.
   活塞直径在环带处影响燃油效率和排放水平。