mǎi / dōng xī / bù néng / zhǐ / kàn / biǎo miàn guāng / nèi zài / zhì liàng / cái / gèng / zhòng yào

买东西不能只看表面光，内在质量才更重要。

When buying things, you can't just look at the glossy surface; the inner quality matters more.