time zone
noun [ C ] uk/ˈtaɪm ˌzəʊn/ us/ˈtaɪm ˌzoʊn/
时区
one of many equal parts into which the world is divided. In any place within each part, the particular point in the day is the same, and is an hour in front of or behind that in the parts on either side
If you go from New York to London, you cross five time zones. 从纽约到伦敦要跨越5个时区。