work at
definitions
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to try hard to achieve something or to focus effort on a particular taskzh: 努力从事;致力于
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to work on a specific job or taskzh: 从事某项工作
examples
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She is working at improving her public speaking skills.
她正在努力提高自己的公开演讲技巧。
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He works at a local bakery.
他在一家当地面包店工作。