rarer/rer/形容词稀少的;罕见的;不常发生的a rare disease/species罕见疾病/稀有物种(肉)煮得半熟的,煎得嫩的I'd like my steak rare, please.请把我的牛排煎嫩些。(山顶空气)稀薄的想跟读,去练习