1. 壓艙物;鎮重物 Ballast is any substance that is used in ships or hot-air balloons to make them heavier and more stable. Ballast usually consists of water, sand, or iron.
ballast英英釋義
noun
1. any heavy material used to stabilize a ship or airship
2. an electrical device for starting and regulating fluorescent and discharge lamps
Synonym: light ballast
3. a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)
Synonym: ballast resistorbarretter
4. an attribute that tends to give stability in character and morals something that steadies the mind or feelings
5. coarse gravel laid to form a bed for streets and railroads