Take the door knob off a door and put it back on backwards, then lock it and leave the door open.

取下门把手，装到门的另一侧，并且让门开着。

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A bolt on a lock that is moved by turning the key or knob without activation of a spring.

一种锁闩，在没有弹簧的作用下，靠转动钥匙或把手使它移动。

youdao

All have a reversible thumb knob for one-hand easy opening and spring-loaded lock for closing.

逆向拇指把柄，一只手就可以将其轻松打开或闭合。

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The Smart Knob promises a smarter, more secure deadbolt lock that lets us issue time-limited unlock codes or give trusted visitors a way in.

ENGADGET: March 16, 2013 4:15 PM EDT