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

【分析】并列复合句。and 连接两个并列分句。第一个分句为简单的主系表结构，第二个分句主干为 those reviewers...could be trusted to know...。句中 who 引导的定语从句修饰 reviewers, like George Bernard Shaw and Earnest Newman 为插入语，表举例，what 引导的从句作的 know 的宾语。

【译文】这些评论家们所从事的是严肃的事业，甚至那些喜欢卖弄学问的评论家们（像萧伯纳和欧内斯特•纽曼）也知道在做什么，这一点是可以肯定的。

5. "So few authors have brains enough or literary gift enough to keep their own end up in journalism," Newman wrote, "that I am tempted to define "journalism" as "a term of contempt applied by writers who are not read to writers who are"."

【分析】多重复合句。句子主干为 Newman wrote...，引号内是 wrote 的宾语。宾语部分其实是一个 so...that...句型。前一引号中，两个 enough 分别作 brains 和 literary gift 的后置定语，to keep their own end up in journalism 为目的状语。后一引号中，that 引导结果状语从句，主干为 I am tempted to define...as...。其中 applied by...to... 作的后置定语，两个writers 后面都有 who 引导的定语从句修饰。

【译文】纽曼写道，“拥有足够思想或足够文学天赋能在新闻业中成就自己的事业的作者是如此之少，以至于我禁不住把“新闻业”定义成“被某些不受读者欢迎的作家应用在拥有大量读者的作家身上的一个表示轻蔑的名词”。