no valid reason

常见例句

As long as the session is open and valid there is no reason to run the login process again.
只要会话处于打开状态并保持有效，那么就没有必要重新运行登录过程。
But the youthful conviction that the world is there any chance to get together again, for no valid reason a person does not appear in another person's life.
但秋水坚信这世上没有偶然的相逢，一个人不会无端地出现在另一个人的生命里。
chaoliuz.com
But Gallas' agent Pierre Frelot now claims the player had a valid reason for the no-show.
而根据加拉的经纪人皮尔雷·弗莱洛特表示，他的球员并非无缘无故想要缺席练习。