这项研究自1978年以来一直在进行，并已取得了许多实际成果。
This research has been in progress since 1978 and has yielded many positive results.
世界许多学者对气候变化开展了广泛研究，已经取得了丰硕成果。
A lot of fruitful results has been got by researchers of many countries.
世界许多学者对气候变化开展了广泛研究，已经取得了丰硕成果。
A lot of fruitful results has been got by researchers of many countries.
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