National Geographic goes inside the operations of Customs and Border Protections and Homeland Security Investigations at JFK airport - the busiest international airport in the USA.
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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