树皮可以用来制作药物。

Bark can be used to make medicine.

这棵树的树皮很粗糙。

The bark of this tree is very rough.

我们用树皮做了一个小船。

We made a small boat out of bark.

地衣经常出现在树皮上。

Lichen is often found on tree bark.

桦木的树皮非常光滑。

The bark of the birch is very smooth.

树皮被切开时会渗出树液。

The tree's bark ooze sap when cut.

这只狗喜欢在树皮上磨牙。

The dog likes to chew on the bark.

这棵树的树皮粗糙而厚实。

The tree's bark is rough and thick.

熊的爪子可以撕开树皮。

The bear's claw can tear off the bark.

这棵树的树皮在渗出树液。

The tree is exuding sap from its bark.