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While trees are estimated to have spread northwards through a warming Europe after the end of the last ice age at a speed of about 1km per year, this could be down to dormant seeds reseeding the landscape, which would not be possible if species are forced to shift to new territories.

据估计，在最后一个冰河时代末期，树木通过温暖的欧洲，以每年约1公里的速度向北蔓延，留下来的冬眠种子通过自花授粉延续下来。如果该物种被迫迁往新区域，这种情况不太可能再度发生。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。