直到最近，这方面的研究还很少。
There was very little research on the subject until recently.
目前，中国在酒酒球菌分类鉴定方面的研究还很少。
There are few researches on the classification and identification of Oenococcus oeni in China for the present.
但是，埋藏在地下的温室气体会发生什么变化？关于这方面的研究很少。
But few studies have looked at what happens once the gas is in the ground.
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