每天刷牙是一个基本组成部分，以有效保持口腔卫生，帮助牙齿和细菌生物膜(牌匾)牙龈。
Brushing every day is a fundamental component to effective oral hygiene helping keep teeth and gums from bacterial biofilm (plaque).
以稳定运行的全程硝化的生物膜反应器的一个反应单元为研究对象，通过外加氯实现对硝化反应中两类细菌的选择性抑制。
In a cell of biofilm reactor for whole-run nitrification, chlorine was added to achieve the selective inhibition to two kinds of bacteria in nitrification.
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