One reason a couple might choose a Petri dish to unite their eggs and sperm rather than the traditional method, is if one of them carries the gene for a disease.

• 夫妻选择用细菌培养皿（Petridish）而非其他传统方式来结合卵子和精子的一个原因就是，夫妇中一方有可能携带某一疾病的遗传基因。