目前多数机译系统的知识库都是由人工静态建立的，系统不能自行对其进行扩充。
At present, knowledge bases of most MT systems are manually constructed, and systems cannot expand the knowledge bases by themselves.
目前多数机译系统的知识库都是由人工静态建立的，系统不能自行对其进行扩充。
At present, knowledge bases of most MT systems are manually constructed, and systems cannot expand the knowledge bases by themselves.
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