他认为，远在公元前30,000年以前，猎人可能会用一套刻在骨头和石头上的符号系统来标记月相。
He believes that as far back as 30,000 B.C., hunters may have used a system of notation, engraved on bone and stone, to mark phases of the Moon.
这些是刻有图案和符号的动物骨头。
长期以来，历史学家一直对雕刻在墙壁上、骨头上、古代长毛象的象牙上的点、线和形形色色的符号感到困惑不解。
Historians have long been puzzled by dots, lines and symbols which have been engraved on walls, bones, and the ivory tusks of mammoths.
x长期以来，历史学家一直对雕刻在墙壁上，骨头上，古代长毛象的象牙上的点、线和形形色色的符号感到疑惑不解。
Historians have long been puzzled by dots, lines, and symbols which have been engraved on walls, bones, and the ivory tusks of mammoths.
x长期以来，历史学家一直对雕刻在墙壁上，骨头上，古代长毛象的象牙上的点、线和形形色色的符号感到疑惑不解。
Historians have long been puzzled by dots, lines, and symbols which have been engraved on walls, bones, and the ivory tusks of mammoths.
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