Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
G
o
o
g
l
e
|
Forvo
|
+
research or exploratory development
This HTML5 player is not supported by your browser
earth.sc.
研究或勘探开发
el.
研究或探索性研制
Add
|
Report an error
|
Get short URL
|
Language Selection Tips
