clearance
n. 审核批准；（飞机起降的）许可，准许；间距，间隙；清理，清除；（足球等中使对方不能破门的）解围；（银行支票的）结算，兑现
复数 clearances
例句
I'm waiting for clearance from headquarters.
我在等待总部的录用审查许可。
《牛津词典》
The pilot was waiting for clearance for take-off.
飞行员在等待起飞的许可。
They have to wait for clearance from air traffic control.
他们必须等待空中交通管制队下达的起降许可令。
《柯林斯英汉双解大词典》
