I did not understand his strange behavior, but now it is clear as the sun at noonday; he is insane on that subject.

我不明白他的举止为什么那么奇怪，现在可一清二楚了，他对这一门根本就一窍不通。

youdao

I did not understand his strange behavior, but now it is clear as the sun at noonday; he is insane on that subject.

我不明白他的举止为什么那么奇怪，现在可一清二楚了，他对这一门根本就一窍不通。

youdao