Contravalid
反有效的, 无效的
🗣️ 情景例句
To ask if there is some mistake.
想问问是否搞错了。
Good counsel never comes amiss.
忠言有利无害。
After speaking for about half an hour he came to a sad part of the family history.
大约谈了半个小时之后，他谈到了家族史中的一件伤心事。