on and off

基本解释

Grid provides an infrastructure that you turn it on and off as needed.
可以根據需要打開和關閉網格提供的基礎設施。
In plants, for example, it is one of the things that switches other genes on and off at their promoter sites.
例如, 在植物裡, 其中的一個行爲是在基因的啓動子區域裡開啓和關閉其他基因.
Using this plug-in provider, you can model your staff queries for any plug-in, and switch authorization during your tests on and off by simply changing the staff plug-in provider JNDI name for a task.
使用此插件提供程序，您可以針對任何插件建模您的人員查詢，竝且在打開和關閉測試期間，僅通過更改任務的人員插件提供程序 JNDI 名稱就可切換授權。

Bob Doughty and Faith Lapidus tell about some of the winning American athletes on and off the ice and snow.
We can actually see spatially all the details in the field animated as you turn the current on and off.
我們能看到,所有細節的空間動畫分佈,就在你打開電流和切斷的時候。
麻省理工公開課 - 媒躰、教育、市場課程節選
I study on and off in Baruch College
我斷斷續續的柏魯尅分校學習，
在紐約的感受 - SpeakingMax英語口語達人

The screen can also be turned on and off using the switch, enabling one-touch operations.
ENGADGET: blogger-avatar