It follows that unmanned programs are essential for the advancement of science in space.

为此，很有必要开展无人项目，以促进太空科学研究。

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Became an essential part of the computer science and engineering curricula in universities throughout the world and in various professional training programs.

成为全世界大学和各种各样的专业培训项目中计算机科学和工程课程中必不可少的一部分。

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Zhao: Some believe that appearance is an essential qualification to work on TV programs. As a presenter of News 24, how important is appearance to your work?

赵：有些人认为要想在电视节目中工作，外貌是一个重要的条件。作为“24小时新闻”节目主持人，你认为你的工作中外貌有多重要？

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Just as important, a larger economy would provide additional resources and flexibility essential to the reform of entitlement programs, including Social Security and Medicare.

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Further, much of what Medicare Advantage programs offer are non-essential services and benefits designed more to lure customers than provide valuable medical benefits (with some exceptions such as programs that include eye care and, occasionally, dental.) Medicare was never designed for these programs.

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United Nations assistance programs in Gaza have run out of flour and several essential pharmaceuticals, the U.N.

CNN: Rocket kills 2 children after Gaza border reopens