Across the northern hemisphere the deciduous forests are changing.

环绕整个北半球，可以看到落叶林在不断变化。

The first are temperate deciduous forests.

第一类是温带落叶林。

Here, in the deciduous forests of eastern Russia, the winter makes hunting very difficult.

这里是俄罗斯东部的落叶林，冬天使得狩猎变得相当困难。

Many forests in Europe, the United States and parts of Canada are temperate deciduous forests.

欧洲、美国和加拿大部分地区的许多森林都是温带落叶林。

For thousands of years, it was the most abundant tree species across the eastern deciduous forest.

千百年来，它曾是东部落叶林中数量最多的树种。

In some tropical forests, the trees' leaves will fall off in the dry season just like deciduous forests.

在一些热带森林中，树木的叶子在旱季会像落叶林一样凋落。

For thousands of years, it was the most abundant tree species across the eastern deciduous forest. It's lumber was used to create fine musical instruments and hardwood furniture.

千百年来，它曾是东部落叶林中数量最多的树种。它的木材被用来制作精美的乐器和硬木家具。

However, observational work carried out in temperate deciduous forests by Kristina Anderson-Teixeira at the Smithsonian Conservation Biology Institute in Front Royal, Virginia, and her colleagues found no sign of this happening.

然而，弗吉尼亚州皇家前线史密森保护生物研究所的克里斯蒂娜·安德森·特谢拉和她的同事在温带落叶林在进行观察工作时，并没有发现这种情况发生的迹象。