discard : 指把具体的东西抛掉不要，着重扔、丢的动作。
- Discarded food containers and bottles littered the streets.
- The room was littered with discarded newspapers.
- He had discarded his jacket because of the heat.
- 10% of the data was discarded as unreliable.
- She could now discard all thought of promotion.
scrap : 指抛弃过时不再有用的东西。
- They had been forced to scrap plans for a new school building.
- The oldest of the aircraft were scrapped.
- They're considering scrapping the tax and raising the money in other ways.
- We scrapped our plans for a trip to France.
shed : 指毛发、皮肤、叶等经过某种自然的过程而脱落。
- The trees shed their leaves in autumn.
- They ran down to the water, shedding clothes as they went.
- A lorry had shed a load of gravel across the road.
- The factory is shedding a large number of jobs.
- a quick way to shed unwanted pounds (= extra weight or fat on your body)
- Museums have been trying hard to shed their stuffy image.