density drop

例句：

1. 1. The density ofthe soil has dropped significantly due to thedrought.
   由于干旱，土壤的密度已经显著下降。
2. 2. The company's profits havebeen dropping for the past few quarters.
   这家公司过去几个季度的利润一直在下降。
3. 3. Thedensity drop in the ocean is a resultof increased temperatures and rising sea levels.
   海洋密度下降是由于温度升高和海平面上升的结果。