When a city's population grows by 5% a year, it is difficult to keep up.

当一个城市的人口以每年5%的速度增长时，基础设施很难跟得上。

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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。

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To my mother, the poem revealed a parent's affection when her child grows up and leaves.

对我的母亲来说，这首诗表达了父母对孩子长大离开时的爱。

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(SPEAKING) Nujood,who regularly appears at anti-child marriage rallies, says when she grows up, she wants to be a lawyer to help other little girls escape her fate.

VOA: standard.2010.03.27

(Voice) But Kumar is determined to give a good education to his three-year-old son, so that when he grows up, he can live in a bigger house, and afford a car.

VOA: standard.2009.11.27

Meanwhile the Arab world figures out what it wants to be when it grows up.

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When asked what he wants to do when he grows up, 4-year-old Ben Sedgmer blurts out, "Coal miner!"

CNN: The war over coal is personal

She is starting to ask her mom and dad pointed questions, such as whether she still will be able to walk when she grows up.

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