时而

(adv) occassionally; often, but not at any fixed time

ever and agah

now and then

now and again

时而[shíér]

-（事情重复发生）fromtimetotime;sometimes:
Sometimesseveralclustersofwhitecloudsdriftacrossthebluesky.蔚蓝色的天空中，时而飘过几朵白云。
-（叠用）now...now...;sometimes...sometimes...:

在树林中走了一个小时而没有见到什么值得注意的东西，这怎么可能呢？
How was it possible to walk for an hour through the woods and see nothing worthy of note?

我时而喜欢抽一支大雪茄烟。
I like to smoke a big cigar every now and then.

他讲话中时而不自觉地冒出地方方言。
Every now and then he would lapse into the local dialect.

她时而到楼上看看他是否还在睡著。
Every now and again she went upstairs to see if he was still asleep.

他时而去看看他的祖母。
He went to see his grandmother every now and then.

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