Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
English
⇄
Arabic
Chinese
French
German
Russian
+
G
o
o
g
l
e
|
Forvo
|
+
exploratory study
This HTML5 player is not supported by your browser
tech.
探测性研究
Add
|
Report an error
|
Get short URL
