Read Edit View history 当且仅当 dāngqiějǐndāng if and only if Origin Definitions Defs Strokes Stroke Words Sentences Sents Senses Add sense 当且仅当/ 當且僅當 dāngqiějǐndāng if and only if 一个整数是偶数当且仅当它能被2整除。 Edit Delete References Add reference No references for this word.