我认为答案是实际上我们是非常脆弱的动物。而且，我们不想想起我们的脆弱性，这些余额在我们自己的身体内部，我们在地球上的停留时间有多短，以及它的容易结束。
(And I think the answer is that we are, in reality, terribly frail animals. And we don't like to be reminded of how frail we are-how delicate the balances are inside our own bodies, how short our stay on Earth, and how easily it is ended.)