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совсем другое дело 强调
Gruzovik	quite another matter
一般	another pair of shoes; another cup of tea; that's another pair of shoes (Anglophile); horse of a different color (Errandir); quite a different proposition (Anglophile); it makes all the difference in the world (Anglophile); quite a different story (something is quite a different story lexicographer); horse of a different colour (Дмитрий_Р); a horse of another color; game-changer (Bullfinch); a totally different affair (Don Quixote); a whole other story (VLZ_58); a whole new thing (suburbian); another matter altogether (A.Rezvov)
惯用语	a whole new ball game (It's one thing to babysit your friends' kids from time to time, but having your own children is a whole new ball game. Drozdova); an apple off another tree (Bobrovska); a different kettle of fish (dict.cc Andrey Truhachev)
惯用语, 美国人	different kettle of fish altogether (Of course their economic policy is a different kettle of fish altogether.)
数学	is another thing altogether
美国人	new ball game, whole new ball game (Выражение из бейсбола marina_aid)
非正式的	a different bunch of coconuts (Wakeful dormouse)
совсем другое дело!
一般	that's more like it! (Bullfinch)

совсем другое дело: 34 短语, 6 学科

一般	19
惯用语	3
科学的	1
谚语	3
陈词滥调	2
马卡罗夫	6