1.断断续续,间歇地;偶尔;(航海)时而靠岸时而离岸地
2.断断续续,不规则地
1.sometimes but not regularly
1.You know, scientists have collected this kind of information off and on over the years, but a lot of it stays within the science community.
你知道，科学家们这些年断断续续地搜集了此类信息，但很多信息却保留在了科学圈内。
2.As for the political parties, they seem to be able to turn the violence off and on as it suits them.
至于政党，它们似乎可以为满足一己利益而使用暴力或者停止施暴。
3.Only wind in the trees, which blew the wires and made the lights go off and on again as if the house had winked into the darkness.
只有树丛中的风声作响，风把电线吹动，电灯忽暗忽明，好像房子在对着黑夜眨眼。
4.The next step was the lengthy process of turning parts of the system off and on to see what made a difference.
接下来一个漫长的过程开始了，他们把系统的各个部分逐一打开、关闭，看看前后有何区别。
5.We've been a steady buyer off and on [this year] of inpidual items in the corporate-bond market, mostly investment-grade.
我们今年断断续续地买进了公司债券市场的一些个体产品，其中大多为投资级债券。
6.The desire to expand my roots and to bear fruit in my life developed into a tool that I've used off and on for more than 20 years.
在我的生活中，想扩展根系和结出果实的愿望变成了一个工具，我不停地用了二十多年。
7.When I arrive and stand at the turning to Youth, a small path comes into view off and on as if beckoning me.
当我站在青春的路口时，前面有一条小路若隐若现，仿佛在召唤我。
8.They were ashore nigh on a week, and us standing off and on in the old Walrus.
他们在岸上停留了有一个星期光景，我们这些人呆在老‘瓦鲁斯’号上。
9.The cylinder loads mutual lock safety device; the cylinder unable to install, if the switch has not turned off, and on the "on" position.
气瓶装入互锁安全装置；开关未关旋钮处于开的位置气瓶将无法安装。
10.As her patient slept soundly during the night, Nurse Betty was able to doze off and on in a bedside chair .
贝蒂护士的病人夜晚睡的很香所以她就可以在床边的椅子里断断续续地小睡了。