Common data model: astrocytoma model snowflakes model, Constellation model, snow waterfall model.
常见的数据模型有：星形模型、雪花模型、星座模型、雪瀑模型等。
Organization of software development activities was clearly understood at least from a waterfall model perspective.
人们清晰地理解了软件活动组织，至少认可了关于瀑布法的观点。
Organization of software development activities was clearly understood, at least from a waterfall model perspective.
人们明晰天文解了软件活动组织，至少认可了关于瀑布法的观念。
Organization of software development activities was clearly understood, at least from a waterfall model perspective.
人们明晰天文解了软件活动组织，至少认可了关于瀑布法的观念。
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