Besides, it will be a good preparation for the limit concept and the calculus.

此外，也为极限及微积分做一良好准备。

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Mainly with the tool of Mind Map, this paper studied how preservice teachers develop their understanding of limit concept.

职前教师缺乏对极限内容的深刻理解，可以运用画思维导图、访谈和讨论等方法深化职前教师对概念的理解。

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This concept of mobility creates issues of security and manageability of data and applications, and both issues limit the effectiveness of mobile solutions while increasing their operational cost.

这种可移动性概念会在数据和应用程序的安全性和可管理性方面造成问题，这些问题会限制移动解决方案的有效性并增加运营成本。

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Even if you disagree with my strategy you can still make money by using my concept of using GTC Limit Orders to buy weakness to a value level to become more long or less short, or to sell strength to a risky level to become less long or more short.

FORBES: Buy and Trade Beats Buy and Hold