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1.The dog was scratched by a flea and it hurt him a lot.
那只狗被跳蚤咬了，它很痛。
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2. I've been bitten by a tick on my leg, so I need to get it checked out.
我的腿上被蜱虫咬了，所以我需要去看医生。
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3. The doctor gave me some medicine for the bug bite and told me to keep it clean.
医生给我开了一些药膏来治疗那个小虫子咬伤，并告诉我要保持干净。