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1·He must shuck off the bad habits.

他应该改掉过去的坏习惯。

2·You must shuck off the bad habits of the past.

你们必须去掉过去的不良习惯。

3·Before entering, please shuck off your trouble; when returning, bring back your happiness.

进门前，请脱去烦恼；回家时，请带快乐进屋。

4·You're supposed to shuck off your old self, lose track of the news back home and try on an utterly foreign way of life.

可以彻底地放松自己，抛开在家乡发生的所有的事情，尝试全新的、异国的生活方式。