International studies of language middle construction have been continuing for quite a long time.
国际上对中间结构的研究有较长的历史。
It's been a long time since we left our junior middle school.
从我们初中毕业到现在，已有好一段时间了。
The middle of winter has long been a time of celebration around the world.
中间的冬季一直是庆祝时，世界各地的。
The middle of winter has long been a time of celebration around the world.
中间的冬季一直是庆祝时，世界各地的。
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