真空

vacuum;situation characterized by emptiness
二次大战后，欧洲与亚洲出现了许多～。Vacuums appeared in Europe and Asia after World War Ⅱ./总统的死留下政治～。The President’s death left a political vacuum./填补～fill a vacuum/权力～power vacuum/完全～perfect vacuum/～包装vacuum packing/～地带no man’s land/～吸尘器vacuum cleaner