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蓋亞假說是為那些喜歡散步或只是站著凝視的人準(zhǔn)備的，他們思考地球及其承載的生命，并推測人類活動的后果。

乳制品不僅僅是一種產(chǎn)品；它是人們生活的一部分。

"The best time to plant a tree was 20 years ago. The second best time is now."

It is remarkable that a science which began with the consideration of games of chance should have become the most important object of human knowledge.