1. 中子的发生于铀(或钚)块的外表面。
The escape of neutrons occurs at the exterior of the uranium(or plutonium )material.

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2. 中子的发生于铀(或钚)块的外表面。
The escape of neutrons occurs at the exterior of the uranium (or plutonium) material.

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3. 中子的发生于铀(或钚)块的外表面。
The escape of neutrons occurs at the exterior of the uranium (or plutonium) material.

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