起重要作用...

play an important role的音标：...

They also play an important role in immune reactions.它们在免疫反应中也起着重要的作用.Nonbiological degradation processes play an important role in the dissipation of many pesticides in soil.非生物降解过程在消除土壤中的许多农药方面起着重要的作用.Variational princ...