Suggestion: in order to avoid the negative effect the bad latent stimulation, it is necessity to guide healthy main current culture;

建议：要避免隐性劣性刺激对大学生心理健康的负面作用，需要引导健康主流文化；

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Since the analysis and control of asymptotic behavior is main objective to the design project, it is necessity to study the stochastic large-scale system with delay.

在随机时滞大系统的系统分析中，系统的渐近行为分析和控制是工程设计的主要目标。故而，研究时滞随机大系统是很有必要的。

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Therefore, it is necessity to study the problem of design of logistics network of recycling and reusing reusable discarded consumable packages in both practice and theory.

因此，从实际和理论两方面看，都有必要对可再用废弃消费品包装物回收再利用物流网络设计问题进行研究。

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It's definitely a necessity since there is not someone else there to help you with your kids.

VOA: standard.2009.12.04

It is a necessity. He believes that the first priority of any climate bill enacted by Congress must be to put a cap on global warming gases.

VOA: standard.2010.06.14

While updating your applications can be a daunting task, it is a necessity to drive competitive advantage and business innovation.

FORBES: Baby Boomer Retirement: Is Your Data Center Ready?

It is not an easy task to be unique or different but it is a competitive necessity if a startup wants to avoid on other marketing techniques such as relying low prices or spending a lot of money on advertising.

FORBES: How is Your Startup Unique or Different?

But it seems to me that this is a false necessity, where we force people to lie about who they are, rather than merely enabling them to choose not to disclose who they are to begin with.

ENGADGET: Editorial: Facebook, single identities, and the right to be anonymous