Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
English
⇄
Chinese
Finnish
French
Greek
Portuguese
Russian
Spanish
Swedish
+
G
o
o
g
l
e
|
Forvo
|
+
to phrases
challenge response
This HTML5 player is not supported by your browser
manag.
挑战反应
challenge-response
:
5 phrases
in 4 subjects
Aviation
1
Cryptography
2
Electronics
1
Information technology
1
Add
|
Report an error
|
Get short URL
