平缓的河水流淌令人心旷神怡。

The gentle ___flow of the river was calming.

工程师们正在努力改善市中心的交通流量。

Engineers are working to improve the ___flow of traffic in the city center.

源源不断的信息流可能让人应接不暇。

The constant ___flow of information can be overwhelming.