2 sentences for 表皮 (biǎo​pí — epidermis)

1. 他的手臂表皮被轻微划伤了。

   tā de shǒu​bì biǎo​pí bèi qīng​wēi huá​shāng le.

   The skin on his arm was slightly scratched.

   Source: Dong Chinese Dictionary

2. 这种鳄的表皮非常粗糙，像是一层厚厚的铠甲。

   zhè zhǒng è de biǎo​pí fēi​cháng cū​cāo, xiàng​shì yī céng hòu hòu de kǎi​jiǎ.

   The skin of this crocodile is very rough, like a thick layer of armor.

   Source: Dong Chinese Dictionary