形容词
中文翻译：认真的
同义词：
['determined', 'serious', 'earnest']
例句：
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1.She is an earnest student who always studies hard.
她是个勤奋学习的学生。
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2. The manager was earnest in his promises to improve the company's performance.
经理对他的承诺很认真，旨在改善公司的业绩。
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3. He was earnest about helping others and making a difference in their lives.
他全心全意地帮助他人，希望对他们的生活产生积极影响。