没有主存，一个计算机系统则无法工作，主存又可以称作是内存，基本内存，基本存储，随机存储器，或单内存。
A computer system could not operate without main memory, also called internal memory, primary memory, primary storage, random access memory(RAM), or simply memory.
使用Ajax可以在浏览器中保持一个单页面应用程序长达数天，这使内存或其它资源泄漏更加严重。
With Ajax, you can have a single-page application stay in the browser for days, magnifying any problems with memory or other resource leaks that may occur.
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