The sea level stops in a high position for a long time, so both drop of water and current velocity are small.

并且由于海平面高度相对稳定在较高位置，河流纵比降较小，流速也较小。

youdao

The sea level stops in a high position for a long time, so both drop of water and current velocity are small.

并且由于海平面高度相对稳定在较高位置，河流纵比降较小，流速也较小。

youdao