如果你能明智地使用信用卡，它带给你的方便、保护和返利回馈使之成为了一种便捷的工具。

The convenience, protection and cash-back rewards offered by credit cards make them a handy tool if you use them wisely.

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YouTube迅速成长的原因，在于它让使用任何网络浏览器的用户都可以很便捷地观看并分享视频，同时也可以方便地把自制的视频传到网页上。

YouTube had risen so fast by making it easy to watch and share videos in any web browser, and by making it almost as easy to upload home-made videos to its site.

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当今世界有大量的技术可供使用，从文档管理系统到 wiki，这使得能够相对便捷和方便地达到目的。

There is plenty of technology available today, from document management systems to wikis, that make this relatively straightforward and easy to achieve.

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