1. Give sb security clearance 
   保安部门给予某人的机密工作许可
2. It’s much easier to say, “expedite”, than it is to think of a more exact clearance. But, by forcing yourself to avoid this tendency and issue a clearance based on time, distance, rate of climb, etc.., our actions become less costly in the future. 
   简单地发一句“尽快”的确比发其他准确的管制指令要容易的的多，但我们要强迫自己摆脱这种趋势，而给出包括时间、距离、上升率等等准确信息的管制指令，否则我们的工作将会没有价值。
3. clearance of flood channel obstruction 
   行洪道清障
4. Clearance sale; be on sale 
   甩卖
5. There is not much clearance. 
   没有太多空间。

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