干净、整洁的提单即为清洁提单。
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When you're_____ a crisis, it often helps to talk to someone.
法洛四联症脑缺氧发作立即取（）
_____you understand this rule ，you‘ll have no difficulty in dealing with such problems.
He‘s working hard_____.
The outline of rooftops and chimneys ________ against the pale sky.