A sack of rice的用法和样例：
- Now, as to vegetable, give me a sack of potato.
- He hiked up a sack of grain on his shoulder.
- We are running out of rice; go to the supermarket to buy a sack of refined rice.
- The poor thing has a figure like a sack of potatoes.
- There is a sack of potatoes at the corner of the room.