YOU SAID:

And trees weren't always biodegradable

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そして、木は常に生分解性ではなかった

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And trees have not always been biodegradable

INTO JAPANESE

そして、木は常に生分解性であったとは限らない

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And trees are not always biodegradable

INTO JAPANESE

そして、木は常に生分解性ではありません

BACK INTO ENGLISH

And trees are not always biodegradable