This object is already deleted. It is not valid.
此对象已被删除。它是无效对象。
Not only is it valid, it must be valid. And why is that?
不只有效，而且肯定有效，为什么呢？
An empty string is a valid value; it is not no value.
一个空字符串是一个有效的值，而不代表没有值。
Why Is It Said That Research About Groups Is NOT Always Valid And Relevant?
为什么说研究团体并不总是有效的，相关的？
Why Is It Said That Research About Groups Is NOT Always Valid And Relevant?
为什么说研究团体并不总是有效的，相关的？
应用推荐