2. There is nothing like a relatively unexpected shock to the system such as this to
engender a variety of responses, both good and bad.
没有什么事件能像这次病毒传播对现行的体制造成如此大的打击,这引起的反应有好有坏。
3. And the
engender and growth of biofilm can not depart from the using of carriers, it is the purification main body in waste water processing.
而生物膜的产生和生长离不开载体材料的使用,载体在废水处理中是起净化作用的主体部分。