Documenting the purpose of your code makes its intent easier to understand and extend.

注释代码的目的有利于代码理解和扩展。

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You don't need to know much to understand and extend the grammar, which can be very helpful when you're tackling large projects.

不需懂得太多就可以理解扩展文法，在对付大项目时，这对您非常有帮助。

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Their scientists eventually began to understand the importance of blood type, and experimented with anticoagulants in order to extend the lifespan of their stores.

他们的科学家后来终于开始了解血型的重要性，并且试验出了抗血凝的方法，以延长血液的保存时间。

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And if that wasn't enough, Onavo Count also seamlessly integrates with Onavo Extend so that users can see how much data is being consumed by each app along with the amount of data saved by Onavo Extend in one beautiful and easy to understand screen.

ENGADGET: Data hungry apps revealed with Onavo Count, free usage tracker for iOS

J. failed to understand that the grip of tyrants is always fragile and that the purpose of engagement is to extend freedom.

FORBES: Magazine Article

As long as all of you understand the immense and incredible power that you possess when you work together, when you join voices, when you extend yourselves not just on behalf of your own ambitions but on behalf of a larger cause, you cannot be stopped.

WHITEHOUSE: Remarks by the President at Staff Inaugural Ball