The certification tool is not guaranteed to find all problems with an IDML book, but if a problem is found the tool provides helpful debugging information.

这个认证工具并不保证能够发现ID ML图书的所有问题，但如果发现一个问题，它将提供有用的调试信息。

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Going for a walk to catch some fresh air, reading an interesting book or simply going to the cinema can sometimes be helpful.

出去走走呼吸一下新鲜空气，阅读一本有趣的书，或者就去看看电影，有时都能提供帮助。

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Tell others, especially people who have already published a book, about your intention to write a book. You never know what kind of helpful advice you might get!

首先要把你写书的想法告诉别人，特别是那些已经出过书的人，因为也许就有人能在某些方面给你有用的建议！

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I think these extra pictures sometimes they're helpful, sometimes they just make the book cost a lot more.

我想这些补充的图片有时是有用的,有时仅仅是把书价抬高了一点

耶鲁公开课 - 基础物理课程节选

The book is a thoroughly helpful take on the relationship struggles faced every day by those trying to start up or maintain a business and, thus, a welcome addition to the troves of information aimed at bolstering the people who make the U.S. economy go.

FORBES: 7 Tips From Meg Hirshberg For Family Life Of Entrepreneurs

Book an Orchid Club room for helpful extras including complimentary laundry or pressing, a hot breakfast buffet and evening cocktails in the handsome 16th-storey lounge.

BBC: Business trip: Singapore

On Amazon.com, for example, book reviewers get rated by other shoppers, who can click a button describing whether a review was "helpful" or not.

FORBES: Magazine Article