lower low water datum

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. The company's profits have been lower than expected.
   公司的盈利低于预期。
3. 3. The level of pollution in the river has lowered due to the implementation of stricter regulations.
   由于实施了更严格的规定，河流中的污染水平已降低。