"ebb" in Chinese (Simplified)
退潮衰退
Definition
向陆地撤退（如海水退潮时），或逐渐减弱、变弱（比如力量、情感或资源）。
Usage Notes (Chinese (Simplified))
多用于正式或文学语言。常指海水退潮，也可比喻某事物正在减弱，如“at a low ebb”（在最低谷）。不用于形容迅速的减少。
Examples
The tide started to ebb in the evening.
傍晚时分，潮水开始**退潮**。
His energy seemed to ebb after the long week.
经过漫长的一周后，他的精力似乎在**衰退**。
At low ebb, the river reveals many rocks.
在**退潮**时，河里会露出许多石头。
Her confidence is at a low ebb after the bad news.
坏消息之后，她的信心**跌到了低谷**。
As the excitement began to ebb, people started leaving the party.
当兴奋开始**消退**时，人们陆续离开聚会。
Opportunities can ebb and flow, so stay alert.
机会会**起起落落**，所以要保持警惕。