《高分突破 英語專業(yè)四級聽寫》機械工業(yè)出版社

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Strange things happen from time to time when you travel, because people divide the earth into twenty-four time zones, one hour apart. You can have days with more or fewer than twenty-four hours, and weeks with more or less that seven days. If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone every day. As you enter each zone, the time changes one hour. If you travel westward, you put your watch back; and if you travel eastward, you put it ahead. Each day of your trip has either twenty-five or twenty-three hours. If you travel by ship across the Pacific, you cross the International Date Line. By agreement a new day begins at this line. When you cross the line, you change your calendar one full day, backward or forward. If traveling eastward, today becomes yesterday; if westward, it is tomorrow.