Nevertheless, we spend the vast majority of our energy focused on this level of the pyramid, trying to tackle things that are already completely adapted to human beings, that are going to be very very difficult to address — as we've seen in the case of HIV.
Sin embargo, dedicamos el mayor tiempo de nuestra energía a enfocarnos en este nivel, intentando enfrentar lo que ya se ha adaptado por completo a los seres humanos, y que será muy difícil de encarar, como hemos visto con el VIH.