Although he studied hard， he failed the exam.
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although he studied hard
虽然他学习很努力
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Although he studied hard, he didn't pass the test.
虽然他很努力，但是没通过考试。
youdao
He didn't pass the test, even though (or though, although) he studied hard.
虽然他很用功，但他还是没有考及格。
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