在接下去的几年里，他发现了越来越古老的史前古器物，并推动了日本所知先史学的界限。
During the following years he discovered older and older artifacts that pushed the limits of Japan's known pre-history.
它于1911年首先被美国历史学家详尽地介绍给全世界。
It was first introduced to the world at large by an American historian in 1911.
它于1911年首先被美国历史学家详尽地介绍给全世界。
It was first introduced to the world at large by an American historian in 1911.
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