They have learned that the disease is not well known or easily recognized.
他们已经知道这种病并不广为人知，或并不容易被识别。
Not only did he learned English well but also he spoke French very well.
他不但英语学得好，而且法语讲得很流利。
Marx was not only a learned man, but one of great courage as well.
马克思不但是一位学识渊博的人，而且也是一位具有伟大胆略的人。
Marx was not only a learned man, but one of great courage as well.
马克思不但是一位学识渊博的人，而且也是一位具有伟大胆略的人。
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