Break when a semicolon is followed by a white space; this is assumed to be the end of a conjunction or phrase.
遇到后跟空白的分号时分割，假定为联合句或者短语的结束。
A short phrase or label for each schedule activity used in conjunction with an activity identifier to differentiate that project schedule activity from other schedule activities.
活动描述是一个短语或标签，与活动编码一起，用来区分不同的项目活动。
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