Its bus, which became the S-100, was extensible enough that numerous vendors developed CARDS for the 18-slot system (such as serial CARDS and disk controllers), making it a useful computer.

其总线(变成了S - 100)扩展到足够大量供应商为18槽系统开发卡片(如串口卡和磁盘控制器)，并使其成为一台有用的计算机。

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The stage of the traditional family education has its positive effect. It is very useful for today' s family education to analyze its advantages and disadvantages.

传统的家庭教育有其积极的一面，也有其消极的影响，分析其利弊得失，对于今天的家庭教育或许会有一些启迪。

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First, it "s useful."

首先，它很有用。

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Lieutenant Eakins says it could be useful in preventing crimes such as burglaries in Palm Bay's dispersed residential communities.

VOA: standard.2010.01.01

Now, it's also very useful to look at some of the relations that come out of these fundamental equations.

我们接下来可以考察,从这些基本方程中得出的一些方程。

麻省理工公开课 - 热力学与动力学课程节选

And it's a useful pattern when you want to express that your feelings have been hurt or that you're not liking something,

当你想表达你在情感上受到了伤害或者不喜欢某件事的时候，这是个很有用的句型。

I get so upset 课堂 - SpeakingMax英语口语达人

To understand more, it's useful to know how the supermarkets divvy up the fund world.

FORBES: Supermarket Sweepstakes

It's useful to have cards with your name and job title printed in Chinese on the reverse.

ECONOMIST: Business travel

It's useful to find at least one knowledgeable, trustworthy person to offer guidance on the security landscape.

CNN: Women: Travel safely, but keep traveling