A method of solution is perfect if we can foresee from the start, and even prove, that following that method we shall attain our aim.
The saddest thing about love is that not only that it cannot last forever, but that heartbreak is soon forgotten.
在外交中,信任是一个更宝贵的货币,而不是金钱。
银河系中心是强引力下的一个独特的自然实验。
The market is a great teacher, but it charges a high tuition.