However, we should bear in mind that tourism could have an adverse effect on the local environment.

adverse 是形容词，由前缀 ad-（表示"朝向"）和词根 verse（来自拉丁语 vertere，意为"转向"）组成，字面意思是"转向负面方向"，引申为"不利的、有害的"。 effect 是名词，意思是"影响、效果"，指某事物带来的结果或变化。 adverse effect 指"负面影响、不利后果"，强调某种行为或事物带来的有害结果。