an indoor swimming pool室内游泳池Indoor pollution falls into two categories, that which we can see or smell, and pollution which is invisible and produces no odour.室内污染分为两种：一种是我们能看得见或闻得着的，另一种是无色无味的。The spa has 6 indoor pools,...
Name six perennials and six annuals suitable for indoor flower arrangement.列出多年生及一年生花朵各六种,它们必须是适合插花的.Objective To observe the efficacy of a multifactorial combination air disinfector in disinfecting indoor air.目的观察一种多因子组...