voluntary system of certification
... 实验室认证laboratory certification 自愿认证制voluntary system of certification 法规机构regulatory authorities ...
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... Volumaex 沃露梅克斯 voluntary system of certification 法规机构 Volvo 富豪(沃尔沃) ...
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voluntary system of certification
自愿认证制度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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For the last 12 years, the National Board for Professional Teaching Standards, which operates with private, foundation, and federal funds, has been working to build a system of voluntary national certification for outstanding teachers.
UNESCO: II Part Analytic Section