You can see how the brown bubbles, which is west Europe, and the yellow one, which is the United States, they get richer and richer and also start to get healthier and healthier.
你可以看到这些棕色的气泡，是西欧， 这些黄色的是美国， 他们是怎样变的越来越富有， 同时是这样变的越来越健康。