The birch tree has white bark, and this tough protective outer layer of the tree, this white bark, is waterproof.

桦树有白色的树皮，树上这个坚硬的保护外层，这个白色的树皮，是防水的。

youdao

They are tall and white, the bark, I mean.

它们又高又白，我是说树皮。

youdao

Silvery bark and sunset-colored leaves make for an enchanting combination near Bartlett, N.H., a tiny island of civilization surrounded by the White Mountain National Forest in central New Hampshire.

银色的树皮和日落的红叶造就了新罕布什尔州巴特利特附近的迷人组合，它是新罕布什尔州里一个被中部的白山国家森林所包围的文明小岛。

youdao

But the birch bark not white after all, as you got closer.

NEWYORKER: Amundsen

Within a few hours, he forgot that he had given the order, and in a few dozen years he in turn was forgotten, but these trees still stood, enormous now, some of them dead and looming without bark, white and leafless.

NEWYORKER: Nawabdin Electrician

Brittle-looking birch trees with black marks on their white bark, and some small, untidy evergreens, rolled up like sleepy bears.

NEWYORKER: Amundsen