累的英语单词怎么拼?

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累的英语单词怎么拼?
如题
幸福的单词?

累: 1. cumbersome2. burthen3. tired4. accumulate (ACC) Examples:1. 我真是累极了,简直可以睡上一整天. I'm so tired I could sleep for a whole day.2. 我累得再也走不动了. I was too tired to walk any fu...