閱讀理解
Strange things happen to time when you travel because the earth is divided(劃分)into twenty-four zones(時(shí)區(qū)), one hour apart(一個(gè)時(shí)區(qū)相差一個(gè)小時(shí)).You can have days with more or fewer than twenty-fours, and weeks with more or fewer than seven days.
If you make a five-day trip across the Atlantic Ocean(大西洋), your ship enters a different time zone every day.As you enter each zone, the time changes one hour.Traveling west, you set your clock back, traveling east, you set it ahead.Each day of your trip has either twenty-five or twenty-three hours.
If you travel by ship across the Pacific Ocean(太平洋), you cross the International Date Line(國際日期變更線).By agreement, this is the point where a new day begins.When you cross the line, you change your calendar one full day, backward or forward.Traveling east, today becomes yesterday.Traveling west, it is tomorrow.
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