The history of mankind is a record of the struggle for existence under varying climatic conditions.
人類的歷史是在不同氣候條件下為生存而斗爭(zhēng)的記錄。
Life is too short to waste time hating anyone.
The trace is often more powerful than the original.
A day wasted on others is not wasted on one's self.
Collaboration is key—no great science is done in isolation.