开和关是互补反义词。

On and off are complementary antonyms.

使用开关来切换灯的开和关。

Use the switch to toggle the light on and off.

双拉环，一个简单的开和关。

Dual pull tabs for an easy on and off.

闹钟的开和关是通过拔出和按入闹铃开关实现的.

Pulling out the alarm switch activates alarm and pushing it deactivates it.

通过在泵开和关时电磁阀所进行的开启和关闭来操作泵控制阀。

Solenoid operated pump control for controlled opening and closing on pump start-up and shut-down.

通过在泵开和关时电磁阀所进行的开启和关闭来操作泵控制阀.

Solenoid operated pump control for controlled opening and closing on pump start - up and shut - down.

生产滑套在机械或液压开关工具的作用下进行开和关的上下移动。

Sleeve in the mechanical or hydraulic production tool under the effect of switching on and off the up and down.

开关在任何时候都仅仅是控制着完全开和关。灯也确实是一样。

The switch can only be either totally on or totally off at any given time. The same is true for the light.

从基因的组成研究，他们发现基因的开和关对于生物学和医学同等重要。

They found the way genes are switched on and off is at least as important, both biologically and medically, as the composition of those genes.

一个动态的酶通过增加和去除特定的分子从而实现基因组的转录开关的开和关。

A dynamic cast of gatekeeper enzymes controls this access to the DNA, adding and removing particular molecules to open or close the genome to transcription as needed.