Antimatter has been produced experimentally, but little of it is found in nature.

反物质已在实验室中产生，但还未在自然界中找到。

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The theory had been tested experimentally and found to be true.

用实验检验这个理论，发现它真实无误。

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The theory had been tested experimentally and found to be true.

用实验检验这个理论，发现它真实无误。

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