Principles always become a matter of vehement discussion when practice is at ebb.

当实践陷入低潮时，原则总是成为激烈讨论的问题。

This influences the rate at which daytime ebbs and flows across the seasons.

这会影响整个季节白天的涨落速度。

The leaded windows were bright and speckless, and the door-stone was as clean as a white boulder at ebb tide.

镶铅的窗户明亮而一尘不染，门石干净得就像退潮时的白色巨石。