正当的,有充分根据的,符合逻辑的 (of arguments, reasons, etc.) well based or logical; sound
有效的 that can legally be used for a stated period or in certain conditions
有法律效力的 legally effective because made or done with the correct formalities
句型例句
用作定语
▲~+n.
Do you have valid reasons for your absence?你的缺席有正当理由吗?
He has a valid passport.他有有效护照。
This is a valid will.这是一份具有法律效力的遗嘱。
用作表语
▲S+be+~
His excuse was not valid.他的借口站不住脚。
Is this contract valid?这份合同有法律效力吗?
▲S+be+~+prep.-phrase
This railway ticket is valid for three days.这张火车票的有效期是三天。
补充资料
[同义词] correct, exact, legal, right
[反义词] invalid
[词源]<法语valide(有效的,正当的,合理的)