now and again

Now and again, he caught a whiff of a peculiar smell.

他不时闻到一股怪味。

She considers it beneath her dignity to help with the housework now and again.

她认为偶尔活有失身。

Now and again the hunter can hear a long-draw dolorous whine of some unseen coyote.

猎人不时能听见某只看不见的小林发出的拖长的哀嚎。

Drop in now and again.

有空过来玩吧。