Some cautions must be mentioned—for example good tools are essential to do the job well.

有些警告一定得说，如：工欲善其事，必先利其器。

《牛津词典》

If the input will later be used as parameters to operating system commands, scripts, and database queries, then it is essential that you do so.

如果输入以后会被用作操作系统命令、脚本和数据库查询的参数，那么对输入进行清理是非常重要的。

youdao

Do they really feel essential to your life, or when you think about them, do you feel like you'd be better off if you spent money on the list of goals you created earlier this month?

它们是不是你生命中不可缺少的？或者当你看到它们，你是不是觉得你更应该在你这个月早些时候列出的目标列表上花费更多的钱？

youdao

Prospective teachers should be required only to hold a college degree, pass a test of essential skills, and be checked to make sure they do not have a criminal background.

ECONOMIST: It's getting easier to change your mind and become a teacher

The President is not willing to do that -- because those industries will be essential to the economic growth of the United States in the 21st century and to the energy security of the United States in the 21st century.

WHITEHOUSE: Gaggle aboard Air Force One en route Orlando, FL,

Intelligence is essential in combatting gangs, and deputies simply do not know individual gang members enough to be effective.

NPR: Terror, Hope on the Streets of Compton, Part 2