但在他们消失之前，他们把自己的基因传递给了欧洲人。
But before they disappeared, they also passed down their DNA to Europeans.
在你抓住他们之前，他们可以不停的变化地点或者干脆消失。
They can change to another place or disappear even before you find them.
他们还发现这种差异消失在19,000年之前，同时也是冰原开始融化的时间。
They also found this discrepancy disappeared around 19, 000 years ago, which is also when the ice sheets began to melt.
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