Read Edit View history 当且仅当 dāngqiějǐndāng if and only if Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 当且仅当/當且僅當 · dāngqiějǐndāng · if and only if 2026/03/04 当且仅当 / 當且僅當 dāngqiějǐndāng if and only if if and only if 一个整数是偶数当且仅当它能被2整除。 created sense Mar 4, 2026, 02:25 AM