Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
English
⇄
Chinese
German
Russian
G
o
o
g
l
e
|
Forvo
|
+
concave diffraction grating
met.
凹衍射光栅
tech.
凹
衍射
光栅
Add
|
Report an error
|
Get short URL
|
Language Selection Tips
