翻译:它最终完成了这一系列教科书的写作,但这是以他的健康为代价的.(at the cost of)
问题描述：
翻译:它最终完成了这一系列教科书的写作,但这是以他的健康为代价的.(at the cost of)
答
Finally he finished the writing of a series of testbooks,but it was at the cost of his health.
答
She finished the writing of a series of testbooks at last,but it was at the cost of her health.