这一段谈的是表达能力，它的重要性与职业，身份有关，从"not need much skill"或 "of little importance"到 "more important"，最后是 "most important"。
b.由一般到特殊排列(general-to-specific arrangement)
If a reader is lost, it is generally because the writer has not been careful enough to keep him on the path. This carelessness can take any number of forms. Perhaps a sentence is so exces。
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