omit
去书内
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用户870497
This rule is difficult to apply; it is frequently hard to decide whether a single word, such as however, or a brief phrase is or is not parenthetic. If the interruption to the flow of the sentence is but slight, the commas may be safely omitted. But whether the interruption is slight or consider-able, never omit one comma and leave the other.
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用户824154

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