Marcus thinks the foremost technical obstacle is that "we don’t really understand enough about how the brain works."
Marcus认为最大的技术障碍是“我们根本搞不明白大脑是如何工作的。”
Multimedia Database has been the highlight among all kinds of study in the field of Database research, and yet there are still many technical obstacle to overcome.
多媒体数据库是当前数据库研究的热点，也存在很多的技术难点。
Currently, the Chinese herbal medicine is confronting with an important obstacle to go outside is the international technical trade barrier and the green barrier.
当前，中药走向世界面临的一个重要障碍就是国际技术性贸易壁垒和绿色壁垒。
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