英语语法分析

Biofilm communities can harbor bacteria longer and are very difficult to clean.

生物膜群落容纳细菌的时间更长且很难清洗。

Based on the experiment of biofilm A/O process, the feasibility of brief-nitrification in attached microorganism system is studied.

基于菌膜厌氧好氧工艺法流程试验，对附着微生物简短硝化的可行性进行了研究。

Normally, viruses have a hard time penetrating the dense layers of a biofilm.

通常病毒很难穿透稠密的生物膜。