I have no appetite because I didn't sleep well last night.

昨晚没睡好,吃饭不香.

《现代汉英综合大词典》

I have no appetite.

我胃口不好.

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Jessica: Well, you seem to have no appetite today. Maybe you need me to help eat it.

洁西卡: 这个嘛, 你今天看起来好像?什么胃口. 说不定你需要我帮你吃.

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