五年前，美国国土安全部调查了一起运自泰国的可疑货物案件，发现了一块史前的骨骼化石。
Five years ago, the United States Department of Homeland Security investigated what it considered a suspicious shipment from Thailand and found instead a prehistoric bone.
这次发现提高了人们的意识，使人们注意到泰国不太为人所知的一面，即泰国有着丰富的史前历史。
The discovery helped to raise awareness of the rich prehistoric past of what is an otherwise obscure part of Thailand.
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