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2020考研英语：长句小练精讲解析7
While warnings are often appropriate and necessary — the dangers of drug interactions, for example—and many are required by state or federal regulations, it isn't clear that they actually protect the manufacturers and sellers from liability if a customer is injured.
【分析】
在这个主从复合句中，while引导的从句由两个部分组成，中间用and连接。破折号之间的部分是举例说明warnings的内容，做为插入语。注意：many are required by state or federal regulations中的many是指many warnings。it isn't clear … is injured是主句，主句用了一个形式主语it，真正的主语是that引导的从句，they actually protect the manufacturers and sellers from liability是主体，之后是一个if引导的条件从句。
【词汇】
interaction 相互作用
federal 联邦
regulation法规
protect…from…保护…以免
liability 责任 (be liable for对…负责)
【译文】 尽管警告常常是适当而且必须的——比如对于药物相互作用的危险提出警告——许多警告还是按州或联邦政府规定要求给出的，然而(我们) 并不清楚，如果顾客受到伤害时，这些警告是不是确实可以使得生产者和销售者豁免责任。
精讲2：
The debate was launched by the Government, which invited anyone with an opinion of the BBC ——including ordinary listeners and viewers to say what was good or bad about the Corporation, and even whether they thought it was worth keeping.
【分析】
主句是The debate was launched by the Government，后面是which引导的非限定性定语从句，谓语部分比较特殊，是invited…sb. to say …破折号后面是anyone with an opinion of the BBC的解释说明。say后面是两个宾语从句，一个是what引导，一个是whether 引导。
【词汇】
launch 发起...
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