<p style="font-size: 12px;color:#aaa;">版权引用：<a href="https://avopix.com/photo/386980-small-blocky-shapes-of-towns-fields-and-pastures-surround-the-graceful-swirls-and-whorls-of-the-mississippi-river-original-from-nasa"><span style="font-size: 12px;color:black;">“Small, blocky shapes of towns, fields, and pastures surround the graceful swirls and whorls of the Mississippi River. Original from NASA.”</span> </a>由 <a href="https://avopix.com/author/photos/nasa-source"><span style="font-size: 12px;color:black;">NASA (Source)</span></a> 授权许可 <span><a href="https://creativecommons.org/publicdomain/zero/1.0/deed.zh" target="_blank" style="font-size: 12px;color:black;">CC0 1.0 Universal Public Domain Dedication<img src="" style="display: inline-block;height: 16px;width: auto;"></a></span></p>