騎手たちがすっかり緑におおわれた野原で馬を競争させている
騎手たちがすっかり緑におおわれた野原で馬の速度を落としている
The Jockeys are racing horses on the field, which is completely green
The Jockeys are slowing down their horses on the field, which is completely green
Jockeys are racing their horses on the green field .
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