drop pile-hammer

例句：

1. 1. The weight of the snow dropped to a mere 20 pounds.
   积雪的重量降到了仅仅20磅。
2. 2. The temperature dropped significantly overnight.
   温度在一夜之间显著下降。
3. 3. The drop in oil prices has affected our budget.
   油价的下跌影响了我们的预算。