She understands english well--it being understood spoken not

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She understands english well--it being understood spoken not written english is reffered to.句子结
我觉得破折号前后应该算2句话,独立主格前后两句话都可以表示哪几种关系?
it怎么指spoken...referred to呢？我觉得是指代前面那句话啊！

就语法而言,不能算2句话.否则,后面就应该是 "...,but it/ ....It is understood that spoken,not written English,is being referred to.达成了默契,此处说的English是口头而非笔头.
独立主格结构本身的逻辑主语不同于主句主语,实际上就是状语,与主句的逻辑关系根据情况不同主要有伴随、原因、让步、时间
it指spoken...referred to,spoken前面省略了that

it being understood that spoken not written english is reffe .when english is being spoken 翻译 It is not yet pretty well understood what made the rainfo 帮忙翻译It is well understood that To learn English well,_____.A.it must spoken regularly B.muc We may learn ___ English well by ___ it. A．speaking, spoken I can not speak English well.She can not speak English well, It's not easy to speak english well.改同义句 English well is not 英语翻译：Although English is not as old as chinese, it is spoken 英语翻译Although English is not as old as Chinese,it is spoken b It's not easy _____(learn) English well. it is not easy ______(learn)English well