I have rather good knowledge about Asian culture and history since more than 15 years.

我15年前就开始了解亚洲文化和历史，所以对这方面的知识比较熟悉。

youdao

None of the five arbitrators is from Asia or has much knowledge of Asian history and culture.

五名仲裁员中没有一位来自亚洲，不了解东亚文化和历史。

youdao

I have rather good knowledge about Asian culture and history since more than 15 years. I have been travelling in China, Thailand, Vietnam etc.

我15年前就开始了解亚洲文化和历史，所以对这方面的知识比较熟悉。我一直在中国，泰国，越南等地旅游。

youdao