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So, all that's left is the helium nucleus, two protons, two neutrons.
仅留下氦核，两个质子，两个中子。
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$firstVoiceSent
- 来自原声例句
So, all that's left is the helium nucleus, two protons, two neutrons.
仅留下氦核，两个质子，两个中子。
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