These bad habits, if left unchecked, could lead to more serious ones when they become adults.句式:连词+done ...仿写:这种药如果服用不当

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1. These bad habits, if left unchecked, could lead to more serious ones when they become adults.
句式:连词+done ...
仿写:这种药如果服用不当对人的身体危害极大。