mid 70s什么意思?

mid什么意思 temperatures in the mid-to high 20's什么意思 Mid Aut Day 什么意思 Mid-term test 什么意思 Mid-Autumn Festival什么意思 "in the mid-twentieth century"什么意思? mid=(left+right)>>1什么意思 mid公式怎么用什么意思 in the mid-1990s 和 by the mid-1990s有什么区别? it,s mid-autumn day tomorrow汉语意思 英语翻译RT还有：popular since the mid 70sintroduces in the mid 80s mid-1800s