河心

xíng zhì hé xīn bié huàn mǎ

行至河心别换马。

Don't change horses in the midstream.

hé shuǐ chōng jiàn zhe hé xīn de yī cù jù shí

河水冲溅着河心的一簇巨石。

The water is rushing and washing against a group of boulders in the middle of the stream.