I have learnt a lot from cooperating with the group members,espeially(especially) in how to
organize a larg（large) number of people, who have different ideas, into calm discussion
peacefully（不能用peacefully,因为这里的副词不修饰discussion).
如果用了peacefully,修饰的是organize和平地组织,而不是和平地讨论
其实,讨论discussion本来就是和平的,
如不“和平”,那就用argument了.