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The invention of machinery had brought into the world a new era — the Industrial Age. Money had beco

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In humans, if the mother is ailing, the child suffers. We are the cause of the ailing planet and we

尽管我承认有问题存在，但我并不认为这些问题不能解决。(while)

These problems are too complicated to be explained clearly in a few words.

达尔文坚信进化论(The Theory ofEvolution)的基础是物竞天择。