half a bar

例句：

1. 1.He built a wall with half a bar of bricks.
   他用半块砖砌了一堵墙。
2. 2.The builder used half a bar of wood to build the house.
   木匠用半块木板建造了这所房子。
3. 3.Half a bar of gold is enough to buy a new car.
   半块金子就足够买一辆新车了。