If both transactional consistency and availability are required, then this may further narrow the choices.

如果事务一致性和可用性都是必需的，那么将进一步缩小可选择的范围。

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Effective mechanisms for narrowing choices: If you are going to allow for a bit of competition, you have to have some way to narrow down the choices and make decisions.

缩小选择范围的有效机制：如果你允许有一些合理的竞争，你不得不通过一些方法缩小你的选择范围从而最终做出决定。

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Narrow your choices based on the amount of available space in your garden.

选择时，要首先考虑花园里能提供多少空间。

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If I went on and told you what the different incident light was, and what the electrons were ejected with, and then you could look up the ionization energy for the particular different elements, you should be able to actually determine exactly which element it is, but just with the information given, we can only narrow it down to these choices here.

如果我继续告诉大家入射光源是什么，出射电子的动能是多少，那么你可以去查一查,以上各个元素的电离能，这样你就应该能确定,这个元素到底是哪个，但是只凭题目中的信息，我们只能把范围缩小至以上几种元素。

麻省理工公开课 - 化学原理课程节选

What Moody's has done is to narrow the choices available to Germany and its people - and some would see that as a good thing given that the eurozone's financial survival depends on a willingness of Germany to deploy more of its financial resources to the benefit of its over-stretched eurozone neighbours.

BBC: Eurozone nations�� sovereignty v AAA

With the help of folks at the grassroots, we passed historic health insurance reform that will not only extend coverage to 30 million more Americans and give Americans more affordable choices, but will narrow the cruel health disparities between African Americans of different backgrounds.

WHITEHOUSE: Keepers of the Dream Awards Gala

Second, narrow your search by limiting your choices to the ones that include your doctor, your prescription medications, and the services you want.

FORBES: 5 Things You Need to Know Before Buying Health Insurance