1. How calculates best the gestation period? 如何计算最佳受孕期？
2. Early in gestation, a fetus develops smooth, raised pads on the fingers, palms, and feet. 怀孕早期，胎儿的手指，手掌及脚掌生长出平滑的凸起的肉垫。
3. Keepers said Asian elephants have the longest gestation period - at 22 months - of any animal in the world. 动物看护人员说，比起世界上其他动物来，亚洲象有最长的怀孕期——22个月。
英英解释
n.
1. the period during which an embryo develops (about 266 days in humans)
2. the state of being pregnant; the period from conception to birth when a woman carries a developing f
3. the conception and development of an idea or plan
