But as carbon dioxide builds up in the atmosphere, ocean water becomes more acidic.

但随着大气中二氧化碳含量的增加，海水变得酸性更强。

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Scientists have warned that coral reefs face almost certain death as human-induced carbon dioxide builds up.

科学家们已发出警告，随着人类活动导致的地氧化碳增多，珊瑚礁很有可能面临死亡的危险。

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But as carbon dioxide builds up in the atmosphere, ocean water becomes more acidic. And shellfish have trouble growing their shells.

但随着大气中二氧化碳含量的增加，海水变得酸性更强。而甲壳类生物难以生成它们的甲壳了。

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