动词短语
中文翻译：费心
同义词：
["try one's best", 'make an effort']
例句：
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1. She was so busy that she had to be at pains to finish the report on time.
她太忙了，不得不费尽心思按时完成报告。
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2. The teacher was very patient and made an effort to explain the difficult concept.
老师非常耐心，并尽力解释这个难懂的概念。
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3. We all tried our best to help him solve the problem.
我们都尽力帮助他解决问题。