接触線
the ambiguous region between two categories or states or conditions (usually containing some features of both)
2つのカテゴリー、状態または状況の間のあいまいな領域（通常、若干の両方の特性を含む）
but there is still a twilight zone, the tantalizing occurrences that are probably noise but might possibly be a signal in the twilight zone between humor and vulgarity in that no man's land between negotiation and aggression
しかしおそらく雑音だが、信号の可能性のあるものが生じようとする中間帯が未だにある ユーモアと下品の間の中間帯で 交渉と武力侵略の間の無人地帯で