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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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