ballast
英['b?l?st]
美['b?l?st]
- n. 壓艙物，[建] 壓載物；道渣，碎石
- vt. 給…裝壓艙物；給…鋪道渣
英英釋意
- 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