Biting your nails is a bad habit.
咬指甲是一个不好的习惯。
We must break the child of his habit of biting his nails.
我们必须使这个孩子改掉咬指甲的习惯。
We must break the child's habit of biting his nails.
我们必须使这个孩子改掉咬指甲的习惯。
He has the bad habit of biting his nails.
他有咬指甲的坏习惯。
He has grown a bad habit of biting his finger nails.
他养成了咬指甲的坏习惯。
I have a bad habit, I love biting my nails.
我有个坏习惯，爱咬手指甲。
We must break the child of his habit of biting his nails.
我们应该让这孩子改掉咬指甲的习惯。
That boy has a habit of biting his lips.
那个男孩有咬嘴唇的习惯。
That boy has a habit of biting his lips.
那个男孩有咬嘴唇的习惯。
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