可以的，最近很多关于新冠的文章就是这么做的。

arxiv 就是一个提前发步，而且文章在线时间不超过一年的零时在线发布，只为标志自己的成果时间！不属于发表！你直接可以投你想要投的期刊。而且现在很多期刊都会让你在审稿期间，通过他们自己的在线功能提前在线被人浏览！

当然不包括，这是预印本

nature说明里专门有针对预印本的
https://www.nature.com/nature/for-authors/initial-submission

Preprint servers
The Nature journals support the posting of submitted manuscripts on community preprint servers such as arXiv and bioRxiv. We do, however, ask you to respect the following summaries of our policies:

The original submitted version may be posted at any time.
The accepted version may be posted 6 months after publication.
The published version—copyedited and in Nature journal format—may not be posted on a preprint server or other website，

arXiv是预印本，不是正式发表，可以再给期刊投稿。

可以吧，我看到过