"Learn to cooperate" is a speech (argumentative paper), with "(cooperation)" as the topic and two examples. One is (symphony orchestra performance) and the other is (color ball experiment). These two concrete examples show that effective cooperation requires (spirit of cooperation) and (spirit of self-sacrifice). It can be seen that successful cooperation should not only have a unified goal, but also have the spirit of (doing your best to do your own job), (thinking of others), (thinking of the collective) and (self-sacrifice).

I hope this helps.