驯马场

• 馬(horse)RADICAL
• 川(flowing river; downstream current)PHONO-SEMANTIC

A horse submits as smoothly as a river flowing downstream, gentle yet obedient.

• 馬(horse (pictographic))ASSOCIATIVE

The character 馬 depicts a horse with a mane, body, and four hooves running swiftly.

• 土(earth; soil; land)RADICAL
• 勿(don't; must not)PHONETIC

A wide field of land sounds similar to the word for things or objects.