a noted authority on birds
A noted authority on birds; a reference book often cited as an authority. 一个著名的鸟类权威; 一本常被引为权威的参考书 Doctor Huang Xiaoyuan of Hangzhou was a noted authority on skin diseases and infections of all sorts.
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a noted authority on birds
著名的鸟类专家
以上为机器翻译结果，长、整句建议使用 人工翻译 。