1·That afternoon we passed through the Hwai River region.
那天下午我们经过淮河流域。
2·Using the analyses of weather process of an heavy rainfall system, it is found that there is a mesoscale disturbance in the lower troposphere over Yangzi-Hwai valley.
通过一次江淮流域暴雨天气过程的分析，发现在对流层低层存在一种中间尺度扰动。