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。
"A story has no beginning or end: arbitrarily one chooses that moment of experience from which to look back or from which to look ahead."
逝者从未真正离去,他们活在我们讲述的故事中。
The most perfect education, in my opinion, is such an exercise of the understanding as is best calculated to strengthen the body and form the heart.