Как по Английски будет 迂回的

Designating a region of space having one or more internal bounding surfaces (or curves, when the region is two-dimensional) unconnected with the external boundary (e.g. a globe with an internal cavity, or an annulus), so that a closed surface (or curve, when the region is two-dimensional) may be drawn within the region which cannot be contracted to a point without passing out of the region.

Periphrastic.