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Kevin Church/BBC News。业内人士推荐新收录的资料作为进阶阅读
This Tweet is currently unavailable. It might be loading or has been removed.，这一点在新收录的资料中也有详细论述
vertices ← ,[⍳4] faces(+⍤2) v_cnt(⌿⍤2),[2.5] 3 0 1 2⍉l⊤⊢l⍴⍳×/l。业内人士推荐新收录的资料作为进阶阅读