By correlating markings made in various parts of the world , historians have been able to read this difficult code . 把世界各地的刻记互相联系起来，史学家已能读懂这种困难的代码了。
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Besides , it is also practical and effective by engraving marks on expensive equipment 此外，在贵重器材加上财物刻记至为实用及有效。
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The nomads who made these markings lived by hunting and fishing during the last ice age 作出这些刻记的游牧人，依靠狩猎和捕鱼生活在冰河时代的晚期。
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The nomads who made these markings lived by hunting and fishing during the last ice age which began about 35 , 000 b . c . and ended about 10 , 000 b . c 作出这些刻记的游牧人，依靠狩猎和捕鱼生活在冰河时代的晚期。这段时期大约始于公元前35 ， 000年而结束于公元前10 ， 000年。
