| 单词 | trade in |
| 释义 | 1. a tyrant who trades in human lives 2. He trades in his car every three years. trade an old bicycle in for a new one trade off 1. trade off some economic benefits to obtain concessions 2. They traded off with each other several years for first place in the tennis tournament. 3. trade off large and small brushes for rough and fine work |
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