1·Microscopic examination of a cell's chromosomes can reveal the sex of the fetus.
用显微镜检查细胞染色体可以查出胎儿的性别。
—— 《柯林斯英汉双解大词典》
2·The lungs of a fetus secrete a liquid that mixes with its mother's amniotic fluid.
胎儿的肺部会分泌一种能与母亲的羊水混合的液体。
3·Studies of animals, for example, have shown that when a rat experiences stress during pregnancy, it can cause epigenetic changes in a fetus that lead to behavioral problems as the rodent grows up.
例如，对动物的研究表明，老鼠在怀孕期间经历压力会导致胎儿表观遗传发生变化，进而导致啮齿动物在成长过程中出现行为问题。
4·Expectant mothers may not know that what they eat affects the tooth development of the fetus.
准妈妈也许不知道她们所吃的食物会影响到胎儿的牙齿发育。
5·Many imaging tests are not performed during pregnancy so as not to expose the fetus to radiation.
许多成像测试在怀孕期间不能执行，以免使胎儿暴露在辐射中。