now and then

时而, 不时

例句与用法：

I like to go to the opera now and then.

我喜欢偶尔去看歌剧。

He takes my sister out to the theatre now and then.

他时常带我妹妹去剧院。

A few cases of influenza cropped out every now and then.

不时出现一些流行性感冒的病例。

Every now and then he would lapse into the local dialect.

他讲话中时而不自觉地冒出地方方言。

Everyone needs a pat on the back now and then.

每个人都需要不时地得到鼓励。

He went to see his grandmother every now and then.

他时而去看看他的祖母。

详细释义：

ph.

偶尔; 有时