断断续续的英文：
intermittently
off and on manner
intermittent

参考例句：

He says that as an off-and-on dieter for years, he had never cracked 230 pounds.
他说，自己断断续续节食已经很多年，但是他的体重从来没有降到230磅以下。

a snatchy conversation.
断断续续的谈话

Fitful showers of rain
断断续续的阵雨

Off and on
断断续续,不时地

It rained off and on all day.
断断续续下了一天雨。

We have been dating on and off.
我们断断续续在约会。

I have been learning English off and on for 12years
我断断续续学了十二年的英语了

It rained on and off all day long.
今天断断续续地下着小雨

He had four years of schooling off and on.
他断断续续读了四年书。

I have been learning English off and on for 10 years.
我断断续续学了十年英语了。

intermittently是什么意思：
ad. 间歇地

The artillery worried the enemy with intermittent shelling.
大炮以间断的轰击骚扰敌人。

The suspension points here are used to show the intermittence of the dialogue.
这里的省略号是用来表示对话的断断续续。

The different excitation sources are pulsed to give intermittment radiation.
各种激发源形成脉动，以产生间歇的辐射。

off是什么意思：
adv. 掉，下；离开；隔开；切断；停止；；休息；光，完，尽；全部地
prep. 从...离开；从...向下；在...的外面；偏离...；从...分岔；不再从事...；低于...
adj. 关着的；停止流通的；延期的；取消的；不工作的；处于...境况的；萧条的
v.（用于祈使句）走开，滚开；站开
n. 关掉

Is the water on or off?
自来水龙头开着还是关着？

The gilt is off.
幻想破灭了。

to nip off; to cut off; to break
掐断

manner是什么意思：
n. 方式，方法；态度；规矩；习惯；风俗；风格

in a delirious manner.
以精神极度兴奋的方式。

There was an ease in his manner——a gay and light manner it was.
他的态度从容大方――那是一种轻松、愉快的态度。

free and relaxed in manner.
自由的且行为上不拘束的。