Upright birch forests don't develop a canopy; they are more like thickets.

直立的白桦林不会形成树冠；它们更像是灌木丛。

Leaving the birch forest, we drive north, chasing the Summer Solstice all the way.

离开白桦林我们继续驱车向北，一路追赶着夏至。

The road starts among the mixed pine and birch forests that border the River Alta.

这条路从阿尔塔河边的松树和白桦树混交林中开始。

A dog went into the birch forest and had a bivouac there.

一只狗进入白桦树林并在那儿露营。

They live primarily in eastern Russia's birch forests, though some exist in China and North Korea.

它们主要生活在俄罗斯东部的白桦林中， 但也有一些生活在中国和朝鲜。

It takes 160 years for an old-growth pine and birch forest to form — one that is suitable for reindeer to graze in.

一片古老的松树和白桦林需要 160 年才能形成——适合驯鹿吃草的地方。