clearance例句
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
clearance to land.
泰国航空公司说，该飞机已经得到降落许可。