occasionally有什么意思啊?

偶然，偶而；有时

We go for walks in the fields occasionally.

我们偶而去田野里散步。

Occasionally, unusual creatures are washed to the shore, but they are rarely caught out at sea.

一些奇怪的生物偶然被冲到岸上来,然而在海上很少能被捕捉到