引入分层、分组对象的管理机制，极大增强了软件编辑、处理花样设计的功能。
Our newly introduced layer, group object management mechanism strongly strengthens the software's processing technology.
设计：分层抽样，随机分组对照，量效分析。
DESIGN: Grade sampling, randomized controlled quantitative analysis.
设计：分层抽样，随机分组对照，量效分析。
DESIGN: Grade sampling, randomized controlled quantitative analysis.
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