| 单词 | ballast |
| 释义 | ballast n. & v. --n 1. any heavy material placed in a ship or the car of a balloon etc. to secure stability. 2. coarse stone etc. used to form the bed of a railway track or road. 3. Electr. any device used to stabilize the current in a circuit. 4. anything that affords stability or permanence. --vtr. 1. provide with ballast. 2. afford stability or weight to. Etymology: 16th c.: f. LG or Scand., of uncert. orig. |
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