【上位】 the act of bringing two things into contact (especially for communication); "the joining of hands around the table"; "there was a connection via the internet" 2つのものを接触させる行為（特にコミュニケーションのために）。
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【下位】 a casual or unexpected convergence; "he still remembers their meeting in Paris"; "there was a brief encounter in the hallway" 何気ないか予期しないで集まること。
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【下位】 the overlap where two theories or phenomena affect each other or have links with each other; "the interface between chemistry and biology" 2つの理論や現象が相互に影響し合う、あるいはつながり合う重複部分。
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