Although the book is a good primer on all this, its main contribution consists of two surveys-one of users of software, the other of developers-that are unprecedented in both scale and scope.
尽管这是一本在所有相关方面都非常好的入门书，但它的主要贡献在于两方面的调查：用户和开发者。两者无论是深度和范围上都达到前所未有的。
Although some amount of "guesstimation" is inevitable in most estimation activities, the main risk here is its reliance on the expertise, experience, and, often, the instincts of a single individual.
尽管一定程度的“猜测”在很多评估活动中是不可避免的，它的主要风险在于它依赖于个体的知识、经验以及本能。
Although each of the many GC models has its pros and cons, when the goal for an application is short GC pauses, the two main choices are generational and real-time collectors.
尽管许多GC模型都具有自己的优缺点，但当应用程序的目标是缩短GC暂停时，两个主要的选择将是分代(generational)和实时收集器。
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