he was also the first chinese pianist in the 70_year shistory of the competition to win this prize.
问题描述：
he was also the first chinese pianist in the 70_year shistory of the competition to win this prize.
中间为i什么是70—year而不是70years
答
这里70-year作为形容词修饰后面的history
而分开的70 year只能作时间名词,不能修饰另一个名词