estirasen
estirar
Cada pulmón tiene cerca de 3~500 millones de alvéolos, si estos se estirasen, podríamos cubrir entre 70 a 100 metros cuadrados, una cuarta parte de una cancha de baloncesto. | Each lung has about 3~500 million alveoli, which, if stretched out, would be able to cover between 70 and 100 square meters. |
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