Because no vaccine protects 100 percent of kids who get it, epidemiologists rely on "herd immunity" to make sure enough kids are well enough protected to keep a disease from spreading.

因为没有疫苗100%保护那些接种过疫苗的小孩，但流行病学家却根据“群体免疫”确信小孩能够很好地受到保护而防止疾病的传播。

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Before we go any further with the project, I think we should make sure that there's enough money to support it.

在我们推进这个项目之前，我觉得我们应该确保有足够的资金支持。

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Marc Tucker says the aim is to make sure students finish high school with enough skills to succeed in at least a two-year college.

VOA: special.2010.02.25

And besides that, lest that not be enough to make sure everyone can succeed in a course like this, we have a very diligent teaching fellow who not only likes to scribe the courses lectures.

另外，为了让大家都能,学好这门课，我们有一个很勤奋的助教,他很乐意记录下课程教案。

哈佛公开课 - 计算机科学课程节选

So if you're taking... so you have to make sure that whenever you take land that there is enough left for other people to use... - Right.

所以。。。你得保证,占有土地时，要有足够剩余,留给其他人，-对。

耶鲁公开课 - 公正课程节选

The government needs to act now to make sure enough affordable homes are being built, campaign groups have said, after figures showed the number of housing starts in England fell 11% in 2012.

BBC: Government 'must do more on affordable housing'

His successor will face the dilemma of whether to shut off the Carlsbad irrigators to make sure that enough water can flow down to the Red Bluff reservoir in Texas.

ECONOMIST: The Pecos river

Kempton's group needs to sort out some thorny issues, like how to make sure that enough parked cars are available to produce electricity when the utilities need it and that car owners aren't stranded with a depleted battery.

FORBES: Magazine Article