| 单词 | costly |
| 例句 | costly adjective 1.•costly machinery:expensive, dear, high-priced, highly priced, overpriced | informal steep, pricey, costing an arm and a leg, costing the earth. ANT cheap, inexpensive. 2.•a costly mistake:catastrophic, disastrous, calamitous, ruinous | damaging, harmful, injurious, deleterious, woeful, awful, terrible, dreadful | formal grievous. ANT beneficial. |
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