An elephant's gestation period is almost two years.大象的妊娠期几乎要两年。It took him only two months to write the thesis, but the gestation period was two years long.他只花了两个月就写完论文，但孕育期却长达两年。During the gestation period, the infant grows by leaps and bounds.在母体之中的哺育期，婴儿迅速地长大。