changing stage

• 变动水位

changing stage的用法和样例：

例句

1. The flood has slipped below the warning stage.
   洪水已降至警戒水位之下。
2. Changing water levels now at times unleash a miasma of disease from exposed sewage.
   如今，大坝不时地改变水位，从暴露的污水释放出了疾病瘴气。