heavy bag

• n. 〈拳击〉练习袋

heavy bag的用法和样例：

例句

1. He planked his heavy bag of on the table.
   他将沉重的书袋放在桌子上。
2. She put her heavy bag down on the ground and rested for a few minutes.
   她把沉重的包放在地上，休息了一会儿。