if and only if

更新日期：2026-08-14

词语	if and only if
释义	if and only if used to introduce a condition which is necessary as well as sufficient ［表示所述条件是充分且必要的］惟一可能是, 当且只当…时： witches are real if and only if there are criteria for identifying witches. 只有在有标准确认什么是女巫的条件下, 女巫才是真实存在的。
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