| 单词 | 练成 |
| 释义 | 〔practiced〕Acquired or brought to perfection by practice:习得的，练成的：通过练习获得或达到完美、成熟：〔converter〕A furnace in which pig iron is converted into steel by the Bessemer process.炼钢熔炉：一种通过酸性转炉法将生铁练成钢的设备 |
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