"in the mid-twentieth century"什么意思?它的范围是"19XX"还是"20XX"?

in the mid-dell in the mid 1810's怎么翻译 in the mid-60s什么意思 keep the big picture in mid是什么 英语翻译RT还有：popular since the mid 70sintroduces in the mid 80s in the mid-1990s 和 by the mid-1990s有什么区别? the mid-autumn Festival is in the ()lunar mouth.(eight) The Mid-Autumn is a ___festival in chinaa t____ We eat moon cakes in the Mid-Autumn Festival. 对不对Mid-Autumn Festival 前面的冠词用in还是on mid-afternoon的用法She came outside the house mid-afternoon to play.这里mid-afternoon作名词,为什么前面没in the呢? mid-morning是什么意思?有一个句子：we have noly to look in at the school playground any mid-morning.猜不出来mid-morning是什么东西? remove the mid by the mid In winter ,the day gets (d )early.Mid-Autumn day is a (t )festival in China. you enjoy the days___ you spent in Beijing during the Mid-Autumn Festival?填that?结构? people like to enjoy the moon in theopen a______n the mid-autumn day. She's in her mid in his mid-20's