US Army paratroopers of the airborne combat team from the1 st Battalion, 508 th Infantry descend from the sky over northern Italy.
美国第508步兵团第1营的士兵在义大利北部进行空中跳伞演练。
It lasted nearly500 years from the21 st to the17 th century BC, ruled by17 consecutive Kings.
夏朝从公元前21世纪到公元前17世纪，延续了近500年，先后有17位君主。
It can be foreseen that just as the 20 th century is an age of electronic industries, the 21 st century will certainly be an age of optoelectronic industries.
可以预言，正如廿世纪是电子产业的时代一样，廿一世纪必定是光电子产业的时代。
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