慢速英语:Photographer Captured Changing Lives of His People

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短语讲解：

1.Poolaw’s photos show the cultural assimilation that was taking place in American Indian communities during his lifetime.

take place 发生，举行
例句：His graduation will never take place if he doesn't get to work.
如果他不下功夫，就永远不会毕业。

2.Until the late 19th Century, Oklahoma’s Indian Territory belonged to tribes native to the area or that had been sent there from other parts of the country.

belong to 属于
例句：Earls, princes, and kings belong to the nobility.
伯爵、亲王和国王属于贵族。