The bark of trees is often rough.

树皮往往是粗而不平。

youdao

They can develop as flat, discolored areas of skin or as raised growths, often with a rough surface.

VOA: special.2010.07.06

They have also said they are simply not tough enough to withstand the remote and often rough terrain of Scottish hill farms.

BBC: Farmers union welcomes sheep tagging support

Behind a rough, often pompous, exterior, say his friends, beats a kind heart.

ECONOMIST: Germany

Washing does not involve a superficial flick of the flannel, but a vigorous all-over scrub, often with an extremely rough nylon towel.

ECONOMIST: The Japanese are a super-clean lot. Obsessively so?