英语翻译我知道两种1、over the past 100 years；2、in the past 100 years,还

英语翻译我知道两种1、over the past 100 years；2、in the past 100 years,还 in the past 100 years over the past ten years in the past few years和over the past few years有什么区别? 为什么是in the past three years而不是over the past three years over the past twenty years 还是in the past twenty years in the past 3 years 和 over the past 3 years的区别 they --all over the country in the past ten years in the past two years In the past three years in the past few years 这个 in the past over xxx years说法 ok吗