Meaning of hū huàn:
hū huàn
呼唤
Verb
to call out (a name etc); to shout
Tā zài sēnlín lǐ dàshēng hūhuàn tā de péngyǒu.
他在森林里大声呼唤他的朋友。
He loudly called out to his friend in the forest.
Zài cāochǎng shàng, tā dàshēng de hūhuàn tā de péngyǒu.
在操场上,他大声地呼唤他的朋友。
On the playground, he shouted loudly for his friend.