问题描述：
解释句子1. Brush your hair carefully bafore washing
2. She is old enough to buy things alone
3. It is wise of you to wash your hair often
4. It is easy for you to have a short hairstyle
2. She is old enough to buy things alone
3. It is wise of you to wash your hair often
4. It is easy for you to have a short hairstyle
问题解答：
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