Rosendahl对4年内这种“深海绿色能源”能够投入商用充满信心，但同时他也表示依然需要面对不少困难。
Rosendahl is confident that a commercial model of "Deep Green" will be available within four years but he says obstacles still remain.
仔细想想到底是什么促使这些人们在面对如此大的困难的时候依然坚持他们的工作呢？
What could have propelled those people to continue what they were doing in the face of such seemingly unsurmountable obstacles?
仔细想想到底是什么促使这些人们在面对如此大的困难的时候依然坚持他们的工作呢？
What could have propelled those people to continue what they were doing in the face of such seemingly unsurmountable obstacles?
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