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我不是悲觀主義者。我是一個受過現實主義訓練的樂觀主義者。

Sustainability isn't a trend; it's a responsibility we owe to future generations.

Generally speaking， the errors in religion are dangerous； those in philosophy only ridiculous.

To understand the meaning of a sentence， we must consider the speaker's intention and the context of the utterance.

只有當人認識到自己對別人的依賴時，他才是真正自由的。