costly: implies a high price and may suggest sumptuous or luxury OR rarity: the ~ food graced her table.
expensive: a price beyond the thing's value OR the buyer's means: the resort's shop seems rather ~.
dear: a relatively high or exorbitant price, or excessive cost usually due to factors OTHER THAN thing's intrinsic value: coffee was ~ during the war.
valuable: sug. worth measured in usefulness, enjoyableness as well as market value: iron is a ~ commodity.
precious: applies to what is of great even incalculable value because scarce or irreplacable: our ~ natural resources.
invaluable: implies such great worth as to make valuation all but impossible: a good education is ~.
priceless: used like invaluable in a hyperbolic sense, adds even more intensity: a ~ bon mot. (hyperbolic夸张)
costly: 价格高，暗示奢侈或稀少，expensive: 超出价值或承受能力，dear: 由于非本身价值的其他因素, valuable: 有用有市场价值，precious: 稀少、无法替代，invaluable: 巨大价值-->无法估值 , priceless: 和invaluable相同,程度更强。
记忆方法：1）CEDVPIP首字母联想，重组为VIP DE PC: 重要人物的电脑，价格非常昂贵.
2）前三个词表示价格(price)高，后四个词表示价值(worth or value)高有用或稀少。
3）昂贵的意思是价值或价格高mean having a high value or valuation, especially in terms of money.
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