1、This is Because you do not have a valid Security Certificate .
这是因为您没有一个有效的安全性证书。
2、It either provides information or facilitates a change to business data from one valid and consistent state to another.
它提供信息或简化业务数据从一个有效的、一致的状态向另一个状态的转变。
3、The user name should consist of alphanumeric characters and be a valid structure for all systems within an organization so that each person only has one user name.
无效:1.to (or of) no avail; of (or to) no effect; null and void; in vain2.invalidity;invalidation; nullity; invalidation; 无效的invalid; null; nullified; useless; fruitless; futile; ineffective; ineffectual最常用的分别是invalidity;invalidation和invalid