The arrival of artemisinin a few years ago raised hopes, but big obstacles to its widespread use remain.
几年前引进的青蒿素又给人们带来了希望，但对于这种药物的广泛使用还有不少障碍。
Overseas orders are now picking up, but big obstacles remain.
海外订单源源不断，但障碍重重。
Rosendahl is confident that a commercial model of "Deep Green" will be available within four years but he says obstacles still remain.
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.
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。
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