What does 封闭 mean?

封闭
to seal; to close off; closed; isolated
Its characters
- 封 to seal
- 闭 to close
In a sentence
这条路正在修,暂时封闭了。 This road is under repair and has been temporarily closed.
如果热失控发生在电梯这样封闭的空间里,乘客几乎无处可逃
From 电动车为什么不能进电梯? · Why are e-bikes banned from lifts in China?
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