I don't feel myself today.
我今天觉得不舒服。
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今天的几个句子是发生在医院的:1. What's the matter? 怎么了?2. I have a headache.我头疼。3.When did it happen? 什么时候开始的?4. Have you taken any medicine for it? 你吃过什么药吗?