分析英语结构an american engineer made important developments in bar codes in the 1960s,since when bar codes have been widely used.since when句在句中充当什么成分?

分析英语结构an american engineer made important developments in bar codes in the 1960s,since when bar codes have been widely used.since when句在句中充当什么成分? 英语：be的用法 He( )an American. 英语音标中/en/怎么读?如题 是读汉语拼音中的an 还是en? 一个复杂的英语句子American use about seven tenths of their protein in the form of the meat.帮忙分析一下句子结构然后标准翻译 常用英语长句结构分析 英语:并分析句子结构 英语句子结构分析 什么是主系表结构 英语句子结构 英语句子结构分析 什么是主系表结构 英语句子结构 ce train qui s'en va 句法结构求分析指导 what does Louis Uchitelle mean by the disposable American?什么意思,分析句型结构 英语中哪些形容词在其后加en后可构成其及物动词结构 adi+en—vt She is an American. She is an American. an american friend是什么意思? 考研英语句子分析New England's leaders established the basic themes and preoccupations of an unfolding ,dominant Puritan tradition in American intellectual life 这个句子中preoccupations of an unfolding 那个unfolding后面的逗号是什 英语句子结构分析求助Yet it is an observation made so frequently that it deserves comment. The basic notion of what’s an algorithm能不能分析这个of后面的英语结构语法 帮我分析下面英语句子的组成结构American labor movement helped to form Labor Day,but Labor Day is celebrated in September.在这个句子当中help是什么意思啊?本人英语基础不好,望详解.