yú
她生于1949年
tā shēng yú yī jiǔ sì jiǔ nián
She was born in 1949
来信已于日前收到
lái xìn yǐ yú rì qián shōu dào
The letter has been received a few days ago
黄河发源于青海。b）向：问道于盲
huáng hé fā yuán yú qīng hǎi. b) xiàng: wèn dào yú máng
The Yellow River originates in Qinghai. b) toward: asking directions from a blind person