Contravalid
反有效的, 无效的
🗣️ 情景例句
A lot of people come to openings
许多人参加开幕仪式
Half the world knows not how the other half lives.
富人不知穷人苦。
Moondwellers will be able to fly in space at only three percent of the cost of similar journeys by their terrestrial cousins.
月球居民在太空遨游的费用仅是地球上朋友飞越同样路所需费用的3%。