0 something that blocks a road, passage, entrance, etc. so that nothing can go along it, or the act of blocking something in this way -- 阻塞物，障碍物
Physical obstructions, concrete blocks, trenches, and pits make internal movement difficult, as do frequent curfews and closures.
While in the above cases the closing conditions imply infinitely many independent obstructions to trivialization, for actions of many other groups various rigidity phenomena appear.
Inconvenient obstructions like the old gaol-house were demolished.
The above discussion is based upon the assumption that the topography is uniform with no nearby obstructions.
We present here our current experience in the management of such obstructions.
We still do not understand very well what these global obstructions are.
The focus should be upon the recognition of unrelieved obstructions within the outflow tracts and/or residual shunts.
Of course, these data are limited by die small number of pulmonary venous obstructions encountered.
