It only serves the physiological needs and safety needs.

它只服务于主体的这两种需要。

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After physiological and safety needs are fulfilled, the third layer of human needs is social.

在生理、安全需要都被满足了，人类需要的第三层是社交层。

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Still, some schools have re-evaluated their safety needs in response to the concerns of families and communities.

作为对家庭和社区安全担忧的回应，一些学校还是重新评估了他们的安全需求。

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"So whatever needs to be done, needs to be done." Experts warn that no matter what steps are taken to ensure safety, terrorists will adapt and craft new ways to defeat the security measures.

VOA: standard.2009.12.30

Today we have an opportunity to solve the problem by having Congress reallocate the spectrum that Public Safety needs for broadband.

FORBES: 9/11 Safety Update: Why First Responder Communications Hasn't Improved In 10 Years

Public Safety needs its own networks, hardened and sustainable.

FORBES: 9/11 Safety Update: Why First Responder Communications Hasn't Improved In 10 Years

Under an SMS, any change in the air traffic system that could have a safety impact needs to be rigorously analyzed for hazards, the risks of those hazards thoroughly evaluated and the risks eliminated or mitigated to an acceptable level.

FORBES: FAA's Reckless Threat to Close 149 Air Traffic Control Towers in June