溃疡性结肠类与结肠和直肠的多发性腺癌的发生率增高有联系.Ulcertitive colitis is associated with an incidence of multiple adenocarcinomas of the colon and rectum.使用促性腺激素有一定风险, 费用和不便.Use of gonadotropins may involve a amount of risk, expense, and inco...
Motivation to learn must come from the child; it cannot be artificially imposed.学习的动力必须源于孩子自身，是不可以人为强加的。Scientists believe the frozen eggs stand a good chance of a pregnancy after being artificially fertilised.科学家们相信冷冻卵子...