L = [ ['Apple','Google','Microsoft'], ['Java','Python','Ruby','PHP'], ['Adam','Bart','Lisa'] ]
#打印Apple、Python、Lisa: print(L[0][0],L[1][1],L[2][2])
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L = [ ['Apple','Google','Microsoft'], ['Java','Python','Ruby','PHP'], ['Adam','Bart','Lisa'] ]
#打印Apple、Python、Lisa: print(L[0][0],L[1][1],L[2][2])