ballast
n （使船稳定的）压舱物（ball 球，重物）
释义2：
ballast
/ 5bAlEst /
◙ noun, [mass noun] 1. heavy material, such as gravel, sand, iron, or lead, placed in the bilge of a ship to ensure its stability• （碎石、沙、铁或铅等）压舱物 a similar substance carried in an airship or on a hot-air balloon to stabilize it and jettisoned when greater altitude is required• （飞机或热气球保持稳定的）镇重物（升高时可抛弃） (figurative)something that gives stability or substance• [喻] 稳定因素；实质内容 »the film is an entertaining comedy with some serious ideas thrown in for ballast. 这部影片是娱乐喜剧，添加了一些严肃有意义的内容压台。2. gravel or coarse stone used to form the bed of a railway track or the substratum of a road• （作为铁道或公路路基的）道砟 a mixture of coarse and fine aggregate for making concrete• （拌制混凝土的）石渣3. [count noun] a passive component used in an electric circuit to moderate changes in current• （电路中的）镇流器◙ verb, [with obj.] [一般作 be ballasted] 1. give stability to (a ship) by putting a heavy substance in its bilge• 给（船）装压舱物2. form (the bed of a railway line or the substratum of a road) with gravel or coarse stone• 给…铺道砟【IDIOMS】
◘ in ballast1. (of a ship) laden only with ballast• （船）只装有压舱物【语源】
1. mid 16th cent.: probably of Low German or Scandinavian origin
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