lǎo / shī / ràng / wǒ / men / xiě / chū / shí / èr / hé / shí / wǔ / de / suǒ / yǒu / gōng / bèi / shù老师让我们写出十二和十五的所有公倍数。The teacher asked us to write out all the common multiples of twelve and fifteen.