| Front | valueless, invaluable |
|---|---|
| Back | valueless: a.没有价值的，相当于worthless。That bracelet is a cheap, valueless piece of jewelry.那个手镯是一件便宜的、不值钱的首饰。invaluable: a.无价的，非常宝贵的，相当于priceless。Your help in moving the big refrigerator was invaluable.你帮忙搬那个大冰箱，你的帮助是可贵的。 |
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