He must shuck off the bad habits.

他应该改掉过去的坏习惯。

You must shuck off the bad habits of the past.

你们必须去掉过去的不良习惯。

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。