lines of mice和tissue-culture

英语翻译
the word is divided into 24 time zones,lines of longitude divide the zones on a map.the spaces between them showhow far the earth spins in one hour.when fiying east,youput your watch forward an hour each time you cross a time zone.when flying west,you put your watch back an hour.if you cross the Internatianal Date line,you change your calendar,not your watch.you lose a day going west and gain a day going east.