ballast

美 [ˈbæləst]
英 ['bæləst]
  • n.(船中保持平衡的)压舱物;(热气球的)镇重物
  • v.在…上装压舱物[沙囊];为(铁路等)铺道碴;使沉着
  • 网络镇流器;安定器;压载
复数:ballasts  过去分词:ballasted  现在分词:ballasting  
Ballast
n.
1.
(船中保持平衡的)压舱物;(热气球的)镇重物heavy material placed in a ship or hot-air balloon to make it heavier and keep it steady
2.
(用作公路或铁路路基的)道砟a layer of stones that makes a strong base on which a road, railway/railroad, etc. can be built

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