@mengmeng55 好遗憾啊，果然没那么容易呀。如果有更深入的研究就好了。
@eggshell 这个要跟踪好几十年肯定很贵hhh 现在说不定已经有了呢，只是还没到跟踪结束的时间而已！
CleverLibre Social is an inclusive social instance for open discussion, learning, and community. All cultures welcome. Hate speech and harassment strictly forbidden.
