外网下载工具：软件：free download manger，google浏览器插件
Cmd下载，需要下载wget.exe。（放在C:\Windows\System32和C:\Windows\SysWOW64下就可以在任意路径下直接使用了。）
举例如下：
C:\Users\19654\Downloads>set http_proxy=http://127.0.0.1:1080
C:\Users\19654\Downloads>set https_proxy=http://127.0.0.1:1080
C:\Users\19654\Downloads>wget -w 7 -T 2 -t 0 -c http://loki.disi.unitn.it/RAISE/Flat-field/Flat-field.zip
--2019-11-17 21:39:25-- http://loki.disi.unitn.it/RAISE/Flat-field/Flat-field.zip
Connecting to 127.0.0.1:1080... connected.
Proxy request sent, awaiting response...200 OK
Length: 5381509030 (5.0G) [application/zip]
Saving to: 'Flat-field.zip'
Flat-field.zip 0%[ ] 40.01M 1.06MB/s eta 81m 44s^
