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Theirs was a serious business,and even those reviewers who wore their learning lightly,like George Bernard Shaw and Ernest Newman,could be trusted to know what they were about.

词汇：1. business工作

2. reviewer评论家

3.wear one's learning lightly不卖弄学问

3. learning 学问

4.lightly轻微地

5.be about从事于

分句1：Theirs was a serious business

分句2：even those reviewers could be trusted to know（主语补语）

后置定语：who wore their learning lightly

介词短语作后置定语：like George Bernard Shaw and Ernest Newman

宾语从句： what they were about

参考译文：他们所从事的是严肃的工作，即使像萧伯纳和欧内斯特 纽曼一样不卖弄自己学问的评论家，也知道自己在做什么，这点足以让人信任。

翻译之道：1.句中的to know what they were about是主语 those reviewers的补语，译者将主语和补语处理成并列分句，末尾以“这”字进行概括，符合翻译之道，值得一学。2.句中的who从句直接译为定语，不显局促，可取。