And, as I already said, he loved mathematical instruments and telescopes.
我之前还说过，他喜欢数学仪器和望远镜。
It proved to be one of the mathematical instruments that were then in use among seamen.
这原来是当年海员们用的一种计算工具。
It proved to be one of the mathematical instruments that were then in use among seamen.
这原来是当年海员们用的一种计算工具。
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