envelop [ɪnˈveləp]

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vt.包，封，遮盖；包围；n.信封，包裹

to cover or surround something completely

All combine to form a layer of mist to envelop this region. 织成一层烟雾又笼罩着这个地区。
The dust cloud will envelop the planet within weeks. 产生的尘云将会笼罩整个星球长达几周。