Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
English
⇄
Arabic
Chinese
+
G
o
o
g
l
e
|
Forvo
|
+
closed-open circulation theory
This HTML5 player is not supported by your browser
anim.husb.
封闭和开放循环学说
Add
|
Report an error
|
Get short URL
