Definition: the hard, outside part of a tree Level: C2
桦树的树皮是白色的。
The ___bark of the birch tree is white.
某些昆虫生活在橡树粗糙的树皮下。
Certain insects live beneath the rough ___bark of oak trees.
厚实的保护性树皮有助于树木在森林火灾中存活。
The thick, protective ___bark helps the tree survive forest fires.
