clearance[英][?kl?r?ns][美][?kl?r?ns]
n.清潔，清掃; [建]凈空; 空隙，間隙; 放行證;
例句：
Given the apparently excessive size of the clearance and the eccentric choice of route, some detect a stink of corruption in the smoky air.
從過分的的間隙和奇怪的線路來看，有些人看出來，暗地裏有腐敗行為在其中。
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