摘要:Ann Richards: Democratic National Convention Keynote AddressDelivered 19 July 1988, Atlanta GA Thank[阅读全文]

摘要:Yellowstone National Park, established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872, is a national park located primarily in the U.S. state of Wyoming, thoug[阅读全文]

摘要:国家地理频道（National Geographic Channel，简称NGC）是由美国国家地理学会于1997年成立的一个制作与播放以自然、科学、文化与历史纪录片的付费电视频道。在亚洲地区则与星空传媒合资，于台湾、香港等地皆有播出。[阅读全文]

摘要:International trade is exchange of capital, goods, and services across international borders or territories. In most countries, it represents a significant share of gross domestic product (GDP). While[阅读全文]