he discovered why
他发现了原因
以上为机器翻译结果，长、整句建议使用 人工翻译 。
No idea why he wanted to study saliva, but he then discovered something.
他研究唾液分泌的初衷我们不得而知，但他却因为这个研究而有所发现。
耶鲁公开课 - 心理学导论课程节选
"We haven't discovered why the meanders get locked into position as they are now, " he told me.
BBC: Why, oh why, does it keep raining?
"I discovered the marvelous structure Andrew built at Theory, " says Theyskens, explaining why he came west.
WSJ: A Homegrown Fashion Mogul
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