开合在临床上较少见，多见于恒牙期，指的是在正中合位及非正中合位时，上下颌部分牙齿在垂直向无合接触，称为开合畸形。
弗朗西丝决定把那台机器藏到一块可开合的镶板后面。
Frances decided to conceal the machine behind a hinged panel.
它有一个可以根据需要开合雨伞的内置电动马达。
It has a built-in electric motor which can open or close the umbrella on demand.
蛤蚌留在沙子外面的身体部分接着开始上下移动，并且迅速的开合它的贝壳。
The rest of the clam followed by moving quickly up and down and rapidly opening and closing its shell.
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