| 单词 | ballast |
| 释义 | ballast ['bæl.əst] noun uncountable ■heavy matter such as sand or stone that is used at the bottom of a ship or a balloon to make it heavier, or the small stones on which railways and roads are made （船的）压舱物；（气球的）镇重物；（用作路基的）道砟，石碴 |
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