1. George had a car that could fold up into a Briefcase.
   乔治有一部可以折叠放进公文包的车子。
2. She folded up the letter and put it in her pocket.
   她把信摺起来放进口袋。
3. The soldiers fold up their quilts into cubes.
   战士们的被子叠得四四方方。
4. The boxer folded up in agony.
   那拳击手痛苦地倒下了.
5. The comedian had the audience folding up.
   那个喜剧演员逗得观众笑得前仰后合.

　2个动词解释