【上位】 an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall" 物の内部または間の空間あるいは隙間。
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【下位】 a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively) 底無しの湾か穴。底知れぬ(または、一見底知れぬ)穴、裂け目、または、空洞で、下に広がる(時に比ゆ的に)もの。
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