短语
中文翻译：Unknown
同义词：
['in the effort of', 'at the expense of', 'for the sake of']
例句：
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1. He was atthe pains of writing a novel.
他费力地写了一本小说。
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2. She spent all her time at the pains of preparing for the exam.
她花尽了所有时间准备考试。
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3. They were at the pains of trying to find a solution to the problem.
他们费力地试图找到解决这个问题的方法。