YOU SAID:

After they have first made their domesticated animals dumb

INTO JAPANESE

彼らが最初に飼いならした動物を口がきけない状態にした後

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After rendering their first domesticated animal mute

INTO JAPANESE

最初の飼いならされた動物を無言にした後

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After muting the first tamed animal

INTO JAPANESE

最初にテイムした動物をミュートした後

BACK INTO ENGLISH

After muting the first tamed animal