英语单词“ballast”的翻译、意思、音标，是什么意思-英汉词典-毫安网

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单词	ballast
释义	bal·lastBrE /ˈbæləst/NAmE /ˈbæləst/ noun [U] heavy material placed in a ship or hot-air balloon to make it heavier and keep it steady （船中保持平衡的）压舱物；（热气球的）镇重物a layer of stones that makes a strong base on which a road, railway/railroad, etc. can be built （用作公路或铁路路基的）道砟
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