So, this syntax, the "@username" that Shaquille O'Neal's using here to reply to one of his fans, was completely invented by users, and we didn't build it into the system until it already became popular and then we made it easier.
比方说，大鲨鱼奥尼尔在这使用“@用户名” 来回复他的某个粉丝， 这种用法就完全是用户们自己发明的。 Twitter本来并不支持这种用法，直到大家都开始这么用的时候， 我们才增加了这个功能，方便用户。