Under normal circumstances, these two gases react readily to produce carbon dioxide and water.在正常情况下，这两种气体容易发生反应产生二氧化碳和水。Infections are more likely in those suffering from malnutrition.感染更容易发生在那些营养不良的人们身上。It's easy to have an accident just crossing the road.单是过马路也容易发生意外事故。