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重点讲解：
1. marvel at 惊讶不已；不胜惊羡；大为赞叹；
例句：I marvel at his tremendous achievements.
对他的巨大成就我感到惊叹。
2. look back 追忆；回顾；
例句：She can look back on her career with great satisfaction.
她回顾自己的经历觉得心满意足。
3. be stressed out 极度焦虑不安的；心力交瘁的；
例句：I'm all stressed out about this new job.
我因这个新工作而感到紧张不安。
4. throw up 呕吐；呕出；
例句：This smell is enough to make you throw up.
这种气味令人呕吐。
n. 奇异的事物，罕见的例子
v. 惊异于，惊
