scale disc

例句：

1. 1.The engineer measured the length of the wall with a scale disc.
   工程师用刻度盘测量了墙的长度。
2. 2. The carpenter used a scale disc to measure the thickness of the wood.
   木匠用刻度盘测量木材的厚度。
3. 3. The doctor used a scale disc to weigh the patient's body weight.
   医生用刻度盘称量病人的体重。