Besides, the author understood the rule of negative multiplication completely and studied the problem of permutation and combination deeply. 另外，萨玛瓦尔完全理解了负数的乘法法则，并对排列组合问题也有充分的认识。
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. 但是逐渐地，某些果树最终还是达到了某种基因的排列组合，使得它们的果实比所有其他的苹果都亮一些或甜一些。
