Most of us, however, take life for granted. We know that one day we must die, but usually we picture that day as far in the future. When we are in buoyant health, death is all but unimaginable. We seldom think of it. The days stretch out in an endless vista. 于是我们干着琐碎的事情，几乎意识不到我们对生活的倦怠态度
buoyant adj. 轻快的
unimaginable adj. 想不到的
参考译文:So we go about our petty tasks, hardly aware of our listless attitude toward life.