这种熊分布范围的更多证据在加州的拉布雷亚沥青坑被找到，那里是北美史前骨骼最富集处之一。
Even more evidence of the bear's range was unearthed in California's La Brea Tar Pits, one of the richest sources of prehistoric bones in North America.
这些化石是拉布雷亚的沥青坑中发现的。这是已出土的一批极丰富的史前化石。
They were discovered in the tar pits of La Brea one of the richest finds of prehistoric fossils ever unearthed.
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