经过跨越时区的飞行后，人们常常会有时差反应。
After flying across time zones people often suffer from jet lag.
跨越时区向东飞行要比飞向更早的时区—西方更难适应。
Travelling east across time zones is more difficult to adjust to than travelling west, to earlier times.
现在，企业可以跨越地理界限，跨越时区高效率地进行交易。电子商务已经成为世纪的市场趋势。
With EC, business are now able to conduct transactions across geographical boundaries, across time zones and at a high efficiency. EC has become the market trend of the Century.
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