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1.The study of human reproduction is important for understanding the process of fertilization and pregnancy.
研究人类生殖对于理解受精和怀孕的过程非常重要。
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2. He was able to conceive a child after years of infertility treatment.
经过多年的不孕治疗，他终于能够怀孕生子。
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3. The doctors performed an ultrasound to check the fetus's development and found that it was normal.
医生们进行了超声波检查，以检查胎儿的发展情况，发现它是正常的。