lower return nozzle for medium

例句：

1. 1. The temperature has lowered significantly since the rain.
   自下雨以来，温度已经显著下降。
2. 2. He lowered his voice when speaking to his boss.
   他说话时压低了声音。
3. 3. The company's stock price has been lowering recently.
   该公司的股票价格最近一直在下跌。