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。
ph.
偶尔; 有时