Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
G
o
o
g
l
e
|
Forvo
|
+
simple cluster sampling
This HTML5 player is not supported by your browser
stat.
1/4虻フ撼檠
;
简单整群抽样
Add
|
Report an error
|
Get short URL
|
Language Selection Tips
