I noticed the oddity of his behaviour.

我注意到行为古怪。

From his weird behaviour, he seems a bit of an oddity.

从常行为看来,好像有点怪。

Even today a man who stays at home to look after the children is regarded as something of an oddity.

即使在今天人们仍然认为在家照看孩子男人是个怪人。