请问这句英语应怎样理解?

题目

请问这句英语应怎样理解?
cascading upward through a chain of turbulent features,
接踵而来的是一系列湍流的徵状,
应怎样理解cascading upward through
原全句是（Errors and uncertainties multiply, cacading upward through a chain of turbulent features.）
cascading 的逻辑主语是哪个，cascading upward through 又该怎样理解？

答案

Errors and uncertainties multiply,cacading upward through a chain of turbulent features.cascading 的逻辑主语是errors and uncertainties,因为主句是Errors and uncertainties multiply,已经有multiply作谓语...