霍尔先生明白虽然数学对他来说是很容易
Mr. Hall understands that although mathematics is very easy for him
以上为机器翻译结果，长、整句建议使用 人工翻译 。
霍尔先生明白虽然数学对他来说是很容易的，但是对学生来说却很难。
Mr. Hall understands that although math has always been easy for him, it is not easy for the students.
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