试题详情
超过30万来自世界各地的人，来到美国寻找财富，使旧金山迅速成为一个大城市。
Over 300, 000 people came from all over the world to in the US, making San Francisco quickly become a big city.
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Over 300, 000 people came from all over the world to in the US, making San Francisco quickly become a big city.