1. "Mom" is not right, because the woman or women who supplied the egg and gave birth to the infant would more appropriately be called Mother.
    称呼"妈妈"不正确，因为提供卵子并生下婴孩的女子才更有资格被称为母亲。

2. Columbus made no answer; but after a while he took an egg from a dish and said to the guests, "Who among you, gentlemen, can make this egg stand on end?"
    哥伦布没有答话。过了一会儿，他从盘子里拿出个鸡蛋对宾客们说：“诸位，你们谁能把这只鸡蛋竖起来？”

3. (The only exceptions are egg and sperm cells, each of which contains half the genes to grow a new individual.)
    （惟一的例外是卵子和精子细胞，它们的每个细胞分别含有长成新个体的一半基因。）