| 单词 | ballast |
| 释义 | Word Frequency ballast(ˈbæləst) noun 1. any dense heavy material, such as lead or iron pigs, used to stabilize a vessel, esp one that is not carrying cargo 2. crushed rock, broken stone, etc, used for the foundation of a road or railway track 3. coarse aggregate of sandy gravel, used in making concrete 4. anything that provides stability or weight 5. electronics a device for maintaining the current in a circuit verb (transitive) 6. to give stability or weight to Word origin C16: probably from Low German; related to Old Danish, Old Swedish barlast, literally: bare load (without commercial value), from bar bare, mere + last load, burden |
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