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

1.他不时闻到一股怪。

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

2.不时能听见只看不见的发出的拖长的哀嚎。

3.Drop in now and again.

3.有空过来玩吧。