precise levelling rod

例句：

1. 1. The engineer used aprecise level to ensure the wall was straight.
   工程师用一个精确的水平仪确保墙壁是直的。
2. 2. The scientist conducted an experimentwith precise measurements.
   科学家进行了一次精确测量的实验。
3. 3. The carpenter used aprecise saw to cut the wood.
   木匠用一把精确的锯子来锯木头。