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