偶尔的英文：
occasionally
once in a while

参考例句：

Bang into; run into
撞入;偶尔遇见

The occasional patient will develop a frank postoperative psychosis
偶尔病人发展成明显的术后精神病。

His muse occasionally takes a humorous and satirical turn.
他的诗句偶尔会变得幽默而有讽剌意味。

The country is barren, with here and there a fertile spot.
土地荒芜，只是偶尔有一两片沃土。

A red glow hung near the summit and an occasional minor explosion created a king-size fireworks display from the crater
山顶附近闪烁的红光和偶尔发生的小爆炸，构成从火山口放出的特大焰火。

But I warn you.when you make those occasional sortie into palma,keep a check on your spend.
可是我得提醒你……当你偶尔去帕尔玛游玩时，当心你的开销。

Once in a while
偶尔,有时

Friends visit them occasionally.
朋友偶尔拜访他们。

lodging for occasional or secondary use.
偶尔用到的临时寓所。

Every now and then; sometimes
有时候;偶尔;时常

occasionally是什么意思：
adv. 偶尔，间或

Friends visit them occasionally.
朋友偶尔拜访他们。

It occasionally produces luscious peaches.
它有时会结出些甘甜的桃子来。

If the occasional camper drove along.
偶尔有些露营者路过。

occasional drug abuser
间歇滥用药物者

lodging for occasional or secondary use.
偶尔用到的临时寓所。

once是什么意思：
adv. 一次，一回；一度；曾经
conj. 一旦；一…就…
n. 一次；一回

Once is no custom
一次不成例

Do it for this once.
就干这一次吧。

Gordon is at once modest and clever.(at once …and…既..又)
戈登既聪明又谦逊

This is the leap once of process of cognition.
这是认识过程的一次飞跃。

Slavery was once socially sanctioned.
奴隶制曾经为社会所认可。