ballast-roller

基本解释

• 道碴碾压机

同根派生

英汉例句

• Pig iron used as permanent ballast.
  压载铁做为永久性压舱物的生铁
• The ship was furnished with ballast.
  船上装了压舱物。
• The ride on the roller coaster dizzied us.
  乘坐云霄飞车使我们头晕。
• May I borrow your roller skates?
  我可以借你的旱冰鞋吗？
• The ballast placed in the ship can keep the ship steady.
  放在船上的压舱物可以保持船的平稳。