Contravalid
反有效的, 无效的
🗣️ 情景例句
Will your family be attending the graduation ceremony?
你的家人要来参加你的毕业典礼吗？
In this flat country people grow wheat and corn and raise cattle.
在这个平原国家人种小麦和玉米并且养牛。
I can lend you one and a few pieces of equipment.
我可以借给你一顶帐篷和几样装备。