It's like one of the biggest zoos here in the United States of America.

它差不多是全美国最大的动物园之一。

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In 1860 slaves as an asset were worth more than all of America's manufacturing, all of the railroads, all of the productive capacity of the United States put together.

860年,奴隶作为财产的产值超过了,美国所有的制造业,所有的铁路,和所有产业的产值总和

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