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yearling

/ˈjɪərlɪŋ/C1

一歲大的動物 (n.)

指剛好滿一歲或處於一歲到兩歲之間的動物（如馬、羊、牛等）。

You must shape the horse to the rider.

And start with a yearling

and teach it to respond to the reins and to the boy's voice.