他的评论就像一个中子，既不支持也不反对任何一方。
His comment was like a ___neutron, neither supporting nor opposing any side.
在核反应中，中子能够引发链式反应。
In nuclear reactions, ___neutrons can trigger chain reactions.
中子不带电，它与质子共同构成原子核。
A ___neutron has no electric charge and forms the atomic nucleus together with protons.
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