名词
中文翻译：辛苦
同义词：
['hard work', 'toil', 'labor']
例句：
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1. He worked hard all night to finish the project.
他整夜努力工作以完成这个项目。
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2. The farmer has been working hard all year to harvest the crops.
农民全年都在努力收割庄稼。
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3. She is always working hard to improve her English skills.
她总是努力提高她的英语技能。