比重计

例句：

1. 1. The engineer used a balance to measure the weight of the sample.
   工程师使用天平来测量样品的重量。
2. 2. The doctor weighed her husband's body before burial.
   医生在埋葬前称量了丈夫的尸体。
3. 3. The scientist used a balance to test the accuracy of his new scale.
   科学家使用天平来测试他的新秤的准确性。