A firewall provides an essential security blanket for your computer network.

防火墙为计算机网络提供了基本安全保障。

《牛津词典》

It's true that high-school coding classes aren't essential for learning computer science in college.

诚然，高中编程课对于在大学学习计算机科学来说并不是必需的。

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Economics and Game Theory are now essential tools for understanding human thought and human behavior— those issues connecting to philosophy, computer science, anthropology, literature, theology, and many, many other domains.

经济学和博弈论如今已经成为了,理解人类思维和人类行为的重要方法,这些问题涉及哲学,计算机科学,人类学,文学,神学,以及许多其他的科学领域

耶鲁公开课 - 心理学导论课程节选

Sure, I use a computer as the essential tool for making my daily bread and butter.

FORBES: Is Windows 8 Going To Kill Microsoft?

If I can give just one example, as the manager of a computer department, it was essential that my staff were housed in two separate enclosed areas - one for the data preparation and computer operations staff where noise was inevitable, and the second for the systems and programming staff who needed a quiet environment in which to concentrate and create.

BBC: The pleasures and perils of the open-plan office

Polysilicon is an essential ingredient used in the manufacture of computer chips.

CENTERFORSECURITYPOLICY: Center For Security Policy