<p style="font-size: 12px;color:#aaa;">版权引用：<a href="https://avopix.com/photo/384968-four-engine-usb-model-in-the-40x80-foot-wind-tunnel-large-scale-upper-surface-blowing-model-using-jt15d-engines-test-441-june-18th-1974-original-from-nasa"><span style="font-size: 12px;color:black;">“Four Engine USB Model in the 40x80 foot Wind Tunnel. Large-Scale Upper-Surface Blowing Model using JT15D Engines. Test #441, June 18th, 1974. 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>