唯一要注意的是，如果选择采用单层解决方案，那么服务器必须运行Red Hat Linux 7.3(或7.2)。
The only catch is if you elect to go with a single-tier solution, that server must be running Red hat Linux 7.3 (or 7.2).
第一件，虽然出于生产目的，我们选择实现两层方法，但我们在单层系统上测试了Portal Enable，它运行良好。
One, while we choose to implement a two-tier approach for production purposes, we did test Portal Enable on single-tier system and it worked flawlessly.
颗粒活性炭-石英砂双层滤料组合要优于石英砂单层滤料和无烟煤-石英砂双层滤料，加氯水反冲洗不利于生物滤池的运行。
The granule active carbon (GAC) -sand media is superior to sand media and anthracite-sand media, and the backwashing water with residual chlorine will do harm to the operation of the biofiltration.
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