gram-mass

例句：

1. 1.The weight of the book is 2 pounds.
   这本书的重量是2磅。
2. 2. The heavy rain caused a lot of traffic congestion.
   大雨导致交通拥堵。
3. 3. The scientist weighed the sample to determine its density.
   科学家称量了样本以确定其密度。