gāng gang
不多不少，刚刚一杯
bù duō bù shǎo, gāng gāng yī bēi
Not more, not less, exactly one cup
箱子不大，刚刚装下衣服和书籍
Xiāngzi bù dà, gānggāng zhuāng xià yīfu hé shūjí
The box is not big, it just fits the clothes and books
他刚刚走，你快去追吧！
Tā gānggāng zǒu, nǐ kuài qù zhuī ba!
He just left, go catch up with him quickly!