Tā nányǐ ànnà xīnzhōng de hàoqí, tōutōu kàn le yì yǎn.
He couldn't contain his curiosity and sneaked a look.
Tips
usage
Most often negative: 按捺不住 "can't hold back", with an emotion as the object: excitement, anger, curiosity, an urge. Both characters mean "to press down"; 捺 is also the name of the right-falling brush stroke.
