把应用程序划分为一系列层有助于收缩问题的范围，可以简化容量扩展。
Breaking down the application into a series of tiers helps to reduce the scope of the problem, and allows for easier scaling.
储备污染——污染物在特定环境有一些收缩性容量，如果排放率超过这个容量，此时储备污染就堆积了。
Fund pollutants — pollutants for which the environment has some absorptive capacity, if the rate of emission exceeds this capacity, then fund pollutants accumulate.
它不用冲洗，不收缩，在录的过程中可读，具有日光安全，高容量及许多其他优势。
It eliminates the need for development (process-less material), does not shrink, enables reading between recording sessions, provides daylight safety, higher capacity and many other advantages.
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