What did I do wrong?
modelearth:~# wget http://ftp-master.debian.or… | apt-key get add ziyi_key_2006.asc
–05:38:23– http://ftp-master.debian.or…
=> `ziyi_key_2006.asc’
Resolving ftp-master.debian.org… Usage: apt-key [command] [arguments]

Manage apt’s list of trusted keys

apt-key add <file> – add the key contained in <file> (‘-‘ for stdin)
apt-key del <keyid> – remove the key <keyid>
apt-key update – update keys using the keyring package
apt-key list – list keys

140.211.166.43
Connecting to ftp-master.debian.org|140.211.166.43|:80… connected.
HTTP request sent, awaiting response… 200 OK
Length: 2,017 (2.0K) [text/plain]

100%[====================================>] 2,017 –.–K/s

05:38:23 (33.75 MB/s) – `ziyi_key_2006.asc’ saved [2017/2017]