他的成功是由于幸运 he owed his success in part to luck
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他的成功是由于他的勤俭。
His success was due to industry and thrift.
《新英汉大辞典》
他的成功是由于勤勉和许多朋友的帮助。
He succeeded both because he was industrious and because he had many friends to help him.
youdao
他的成功是由于勤奋。
His success is ascribable simply to hard work.
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