YOU SAID:
the cat jumped over the hurtling boulder
INTO JAPANESE
猫は疾走する岩を飛び越えた
BACK INTO ENGLISH
The cat jumped over the running rock
INTO JAPANESE
猫は走る岩を飛び越えた
BACK INTO ENGLISH
the cat jumped over the running rock
INTO JAPANESE
猫は走っている岩を飛び越えた
BACK INTO ENGLISH
The cat jumped over the running rock
INTO JAPANESE
猫は走る岩を飛び越えた
BACK INTO ENGLISH
the cat jumped over the running rock
INTO JAPANESE
猫は走っている岩を飛び越えた
it is unlikely that this phrase will ever reach equilibrium