The study of bounded quadratic differential systems is very important for its qualitative behavior. However, the results on boundedness of quadratic differential systems have not been completed yet.

二次系统有界性研究对于了解该系统的定性性态甚为重要，但二次系统有界性的结果尚不够完整。

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Qualitative approach emphasizes the relationships between behavior, phenomenon and their background, the process of their changes and the meaning that behaviors and phenomena have towards the actors.

定性方法更加注重现象和行为与背景之间的关系，现象和行为的变化过程，现象和行为对于行为主体所具有的意义。

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At last, a group work behavior transition process is simulated. It shows that this qualitative simulation method can explain and forecast the transition process of group work behavior.

最后对某人群工作行为变化过程进行了定性模拟，表明所提出的人群工作行为定性模拟方法能够较好地解释或预测人群工作行为的变化过程。

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The study, conducted by research firm InsightsNow, combines qualitative, quantitative and ethnographic methods, and tracked user behavior and clickstreams in the US, across mobile web, apps, and other mobile services.

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But to tell the truth, those limits are not apparent to us, either because the power to require the entry into commerce is symmetrical with the power to prohibit or condition commercial behavior, or because we have not yet perceived a qualitative limitation.

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