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4 And then there are the last four, carbon 14, which is a radioactive form.
然后，还有碳，以放射性形式存在。
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$firstVoiceSent
- 来自原声例句
4 And then there are the last four, carbon 14, which is a radioactive form.
然后，还有碳，以放射性形式存在。
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