National Geographic embarks on an expedition into the mysterious world of ancient American history to shed a different light on the history of the Americas. History books traditionally depict the pre-Columbus Americas as a pristine wilderness where small native villages lived in harmony with nature. But scientific evidence tells a very different story: When Columbus stepped ash...
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观看部分外语对白(如英语、美语、日语、韩语、泰语等)的影视节目对口语发音和口语培训有较好的效果，可以一定程度的训练听力和发音