Doctors have continued to improve upon their existing techniques, with incremental improvements in their ability to induce ovulation, grow embryos longer in the lab and more safely transfer them to the womb.

• 医生们仍在对现有技术进行改进完善，如增加诱发排卵的能力、胚胎在实验室生长更长的时间以及更加安全地将胚胎移植入子宫。