wget -r --no-parent https://www.ets.org/gre/
or to retrieve the content, without downloading the "index.html" files:
wget -r --no-parent --reject "index.html*" https://www.ets.org/gre/
Reference: Using wget to recursively fetch a directory with arbitrary files in it
参考：
https://superuser.com/questions/655554/download-all-folders-subfolders-and-files-using-wget
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