by Heart 熟记于心

　　Some plays are so successful that they run for years on end.In many ways, this is unfortunate for the poor actors who are required to go on repeating the same lines night after night. One would expect them to know their parts by heart and never have cause to falter.

　　1.Some plays are so successful that they run for years on end.

　　有些剧目十分成功，以致连续上演好几年。

　　语言点1:句子结构分析:本句中含有一个由so…that…引导的结果状语从句，so successful指出原因“太成功了”，that引出结果“连续上演”。

　　语言点2:由本句的中心词play拓展学习相关词汇:

　　drama 戏剧

　　opera 歌剧

　　Beijign Opera 京剧

　　mummery 哑剧

　　farce 滑稽剧

　　musical 音乐剧

　　The stages 戏剧

　　puppet show 木偶剧

　　2.In many ways, this is unfortunate for the poor actors who are required to go on repeating the same lines night after night.

　　这样一来，可怜的演员们可倒霉了。因为他们需要一夜连着一夜地重复同样的台词。

　　语言点:句子结构分析:who引导定语从句，修饰actors。

　　3.One would expect them to know their parts by heart and never have cause to falter.

　　人们以为，这些演员一定会把台词背得烂熟，绝不会临场结巴的。

　　语言点1:句子结构分析:用one代替people指“人们”不失为一种很好的写作手法，值得我们学习。To know their parts为动词不定式短语，作宾语them的补足语，补充说明“期待他们做什么”。

　　语言点2:do sth.by heart是“凭记忆做某事”的意思。此外，do sth.with ease可理解为“轻松完成某事”，do sth.with difficulty的意思是“做某事有困难或不易”。