けつあな確定：インターネットスラングで、主にネット掲示板やSNSなどで使われる卑俗な表現。元は「けつなあな確定」の誤記・変形とされる。しばしば、発言や行為の結果として「尻の穴（けつあな）を差し出す＝性的な酷い目にあう／報復を受ける」ことが避けられない、というニュアンスで、冗談めかして「もう後には引けない」「逃げられない」「相当な覚悟が必要だ」という意味合いで使われる。}]} મને defer to the user. Let's defer. There is nothing else. Let's move on. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. Let's go. 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おしりのあながひらくようなことをいって、つよいおどしやばつをあらわすことば

“けつなあな確定”的另一写法（变体）。 / 粗俗的网络用语，字面为“肛门已确定”，用来表示“完了/死定了、要遭殃了”。

2階建て

かいだんで行き来できるかいがふたつあるたてもののつくり

两层建筑；双层楼房 / 双层结构（如双层巴士）

股間 / 星座の名前

ほしのなまえなどに使うむかしのかんじのひとつ

胯部；裆部 / 奎宿（中国二十八宿之一）

スタイル / ランク / ステータス / 等級 / クラス

人やものがもつ ねうちや じょうたいの たかさを あらわす ことば

风格 / 等级 / 地位

脚 / 足

にんげんやどうぶつの、からだをささえたり、あるいたりするところ

腿 / 脚 / （动物的）爪子

適切かつ正確

ちょうどよくまちがいがないこと

恰当且准确 / 贴切而精确 / 适当而确切

ある

たしかで、まちがいがないことをあらわす漢字。たしかめるいみ。

确定的 / 确实的 / 确切的

線形代数において、主対角線より上、または下の成分の一方がすべてゼロであるような正方行列。上三角行列・下三角行列などがある。

すうじをしかくにならべたもので、ななめのせんよりうえかしたがぜんぶれいのもの

主对角线一侧元素全为零的方阵 / 上三角矩阵或下三角矩阵的统称

行列の一種で、主対角線上の成分だけが0でない値を取り、それ以外の成分はすべて0であるような正方行列。線形代数で重要な役割を果たす。

たくさんのかずをしかくにならべたものでななめだけにかずがありほかはみなれいのもの

非对角元素均为零的方阵 / 仅主对角线元素可能非零的矩阵

線形代数学において、行列の左上から右下、または右上から左下に伸びる対角線上に位置する要素や成分のこと。行列の特性や固有値などを考える際に重要となる。

かずをならべたますめでひだりうえからみぎしたのななめにあるかず

对角元素 / 对角线元素 / 对角分量