ebb tide 
退潮
- This flow is reversed during the ebb tide, though currents in some parts may be stronger due to the influence of the Pearl River.
潮退时流水方向相反,不过部分地区的海流可能受到珠江影响而变得强劲。 - The tide is on the ebb.
潮水已经涨潮了。 - Every tide has its ebb.
潮起必有潮落。
Ebb tide \Ebb" tide`\
The reflux of tide water; the retiring tide; -- opposed to
{flood tide}.