that is legally or officially acceptable 有效的；正当的◆a valid passport 有效护照◆They have a valid claim for compensation. 他们的赔偿要求正当合理。◆The ticket is valid for three months. 这张票有效期为三个月。
() that is accepted by the system 有效的；被接受的◆a valid password 有效密码OPPinvalid