一本书是一面镜子：如果傻瓜往里看，智者也无法从中看出什么。
"A book is a mirror: if a fool looks in, no sage can look out."
To write is to confront the ghosts of the past and the uncertainties of the future.
The ethical implications of genetic modification must be carefully considered.
膨胀宇宙模型为宇宙的起源提供了一个可能的解释。