查询词典 sudden enlargement

The optimization of the layout of the stilling well was also studied. The results show that the sudden enlargement between the circular inlet and the shaft in this spillway is significantly different from the traditional face-stuck shaft. This can prevent cavitation of the vertical shaft by high-velocity flow, reducing the difficulty of construction.

研究表明，该溢洪道自环形进水口以下采用突扩方式与竖井连接所形成的脱壁水流结构，与传统的贴壁式竖井的水流结构具有明显不同，不仅可以有效避免竖井段因水流流速较高可能造成的空化空蚀破坏，降低施工难度，而且有利于水舌掺气并促进消力井消能。

Means the parent directory, so this command means to execute "toolchain.sh," which is in the current directory.

代表父目录，所以这个命令就是执行当前目录下的"toolchain.sh"。

Yes,In fact,I'm on our city ream.

是的。事实上我是我们市队的。