Contravalid
反有效的, 无效的
🗣️ 情景例句
What are you talking about?
在说什么？
I think you probably know China has adopted a flexible policy in her foreign trade.
我想你也许已经了解到中国在对外贸易中采取了灵活的政策。
'No,' she answered.
“不，”她回答。