clear opening

• 净孔,净空,净宽,有效截面(涵管等的)

clear opening的用法和样例：

例句

1. At that time, a handsome male English teacher came over to help clear the hallway.
   这时，有位帅帅的男英文老师过来帮忙净空走廊。
2. Newark Airport even took special actions to clear the runway so that the flight could land successfully.
   为了让这架班机顺利降落，纽瓦克机场还特地净空跑道。