Never plug a Safety Relief Valve.

不要堵塞安全阀。

youdao

Memory should never contain more than one instance of the plug-in class.

内存中包含的这个插件类的实例从来不应该超过一个。

youdao

In this implementation, passwords are never stored in the clear text in the database, and they are not sent in the clear by the plug-in applications.

在这个实现中，并不用明文在数据库中存储密码，插件应用程序也不发送明文密码。

youdao

If you never plug it in, you still have a fully-functional vehicle.

FORBES: Dissecting Chevy Volt's Super Bowl Commercial

And he was never told to plug the car in overnight in cold weather, despite repeated contact with Tesla.

FORBES: Fake Or Not, New York Times' Tesla Review Speaks Truth About Electric Cars

If that disappears and there is a competitor to defect to, then the result could be a leak of users you will never be able to plug.

BBC: Facebook's battle with privacy and profit