upstream radius of crest

例句：

1. 1. The upstream radius of the crest is crucialfor the stability of the river flow.
   上游半径峰顶对河流流动的稳定性至关重要。
2. 2. Theengineers carefully measured the upstream radiusof the crest to ensure the safetyof the construction site.
   工程师们仔细测量了上游半径峰顶，以确保施工场地的安全。
3. 3. The upstream radius of the crestplays a significant role in determining thefloodplain width.
   上游半径峰顶在确定洪水平原宽度方面起着重要作用。