There is no single emotion for miscarriage or for pregnancy.

对流产或怀孕没有单独一种情感反应。

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Earlier research has shown that an inexpensive single dose of an antiretroviral can reduce HIV transmission from mother to child during pregnancy or delivery.

早先的研究已经表明，便宜的单剂量抗逆转病毒疗法可以减少怀孕或分娩期间母亲对婴儿的艾滋病病毒传染。

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The image of a place overrun by binge-drinkers, feral youths and incompetent single mums misses the improvements in teenage pregnancy rates, smoking and most sorts of crime, for starters.

破坏这片土地的形象的是那些酒鬼，没有礼貌的年轻人和不负责任的单身母亲，他们抹杀了在降低青少年怀孕率，吸烟和各种形式的犯罪方面所取得的进步。

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Dr. Mitalipov said his lab had tried transplanting entire blastocysts into a monkey's womb, but those experiments hadn't yielded a single successful pregnancy.

WSJ: Experiment Brings Human Cloning One Step Closer

England assumed many of the fathers would have high-tailed it out of the picture by the sixth month of pregnancy, leaving single mothers "truly single, " the sociologist said.

CNN: Out-of-wedlock births hit record high

The pregnancy rate among those given single embryos was 39.7%, compared to 43.5% in the double embryo group.

BBC: IVF 'should use one embryo'