Besides, the author understood the rule of negative multiplication completely and studied the problem of permutation and combination deeply. 另外，薩瑪瓦爾完全理解了負數的乘法法則，并對排列組合問題也有充分的認識。
But somewhere along the line, certain apple trees ended up with a combination of genes that made their fruit a bit brighter or sweeter than all the other apples. 但是逐漸地，某些果樹最終還是達到了某種基因的排列組合，使得它們的果實比所有其他的蘋果都亮一些或甜一些。
