single-end neutron 单能中子 ; 单向中子
Neutron stars are the super-dense compact cores of massive stars whose outer shells have been blasted away in violent explosions at the end of their lives.
中子星是超级大行星生命末期大爆炸后，紧密的高密度内核物质组成的，其外部物质随着大爆炸漂离。
The neutron star was once a massive star itself, but has reached the end of its life and collapsed into a tiny stellar remnant just 15 km across.
中子星自身也曾是个重量级的恒星，只不过走到了生命的尽头剩余物质坍缩成直径仅有15千米的星体。
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