ballast
英['bæləst]
美['bæləst]
- n. 压舱物，[建] 压载物；道渣，碎石
- vt. 给…装压舱物；给…铺道渣
英英释意
- 1. any heavy material used to stabilize a ship or airship
- 2. coarse gravel laid to form a bed for streets and railroads
- 3. an attribute that tends to give stability in character and morals; something that steadies the mind or feelings
- 4. a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)
- 5. an electrical device for starting and regulating fluorescent and discharge lamps