They have to wait for clearance from air traffic control.他们需要等空中交通管制人员的放行。He has a security clearance that allows him access to classified information.他获得了安全许可，可以接触机密信息。Thai Airways said the plane had been given clearanc...
The pilot was given clearance to land by air traffic control.飞行员得到空中交通管制站发出的着陆许可。Clearance of the site required the removal of a number of trees.清理这一场所需要移走不少树。Clearance after the fire, Chinese cabbage, Suanmiao Add to th...