The value of life lies not in the length of days,but in the use we make of them.
燃气发动机是所有热机中最完美的,因为它结合了蒸汽机和内燃机的优点。
正如几何学最自然的起点是数学点,在观察和自然历史中采用同样的方法也最真实、简单且富有教益。
Hope is not a feeling; it is a doable, dramatic action.
"A book is a conversation between the author and the reader, across time and space."