In these modern times, almose anything is possible, nothing seems to be beyond the reach of science.
在这个现代社会里,几乎所有的事情都有可能会发生,似乎没有任何事情是科学解决不了的。
later, we shall undergo a progressive loss of our vigour and resistance which, though imperceptible at first,
再迟一些,我们就要经历生命力和抵抗力逐步衰退的过程。虽然这个过程起初难以觉察,