他偶然想出了对那个问题的解答。

He has by chance come up with to the answering of that problem.

youdao

真是非常偶然，岩层能够显现肌肤的纹理，因此，除了肤色外，我们可以相当准确地构想出一种已消亡几百万年的动物。

Very occasionally the rocks show impression of skin, so that, apart from color, we can build up a reasonably accurate picture of an animal that died millions of years ago.

youdao