我注意到在鱼皮肤上有光泽度，所以我需要制作足够有用的光泽贴图。

I'd noticed shiny glossiness in fish skin, so I need to make glossy map which was really effective enough.

youdao

然而，像这样一本书的挑战在于把足够有用的信息压缩在单个章节来让开发人员使用该技术创建应用程序。

However, the challenge with a book like this is to get enough useful information packed in a single chapter to get developers producing applications using this technology.

youdao

第一个要素是输出有用的足够信息。

The first is outputting enough information to be useful.

youdao

Do the following a bunch of times, but a finite number of times which might be useful.

按照下面重复若干次，有限次数就足够了，这很有用。

哈佛公开课 - 计算机科学课程节选