Akerlund diaphragm

"Akerlund diaphragm" Chinese translation ("Akerlund diaphragm" in Chinese, "Akerlund diaphragm" 中文翻译, "Akerlund diaphragm"发音):

Akerlund diaphragm 阿克伦德氏遮光板 [阿克伦德氏遮光板]