... pencil beam 笔形波束 ; 锐方向性射束 ; 笔形束 ; 三维针堆 Cluth Pencil 自动铅笔 pencil rod 细钢杆 ...
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pencil l rod 细钢杆
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Once enriched, one pencil-thin, 14-foot rod of uranium has enough energy to provide 56 years of electricity use by a typical American.
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