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

1.他到一股怪味。

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

2.猎人能听见只看见小林狼发出拖嚎。

3.Drop in now and again.

3.有空过来玩吧。