脸薄

zhè ge hái zi liǎn báo hài pà jiàn shēng rén

这个孩子脸薄，害怕见生人。

This child is very shy, and is afraid of strangers.

tā liǎn báo nǐ shuō huà yào xiǎo xīn

她脸薄，你说话要小心。

Be careful what you say and she's rather thin-skinned.