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市場永遠在變，唯一不變的是對客戶需求的深刻理解。

The world is full of people who have stopped listening to themselves or have listened only to their neighbors to learn what they ought to do, how they ought to behave, and what the values are that they should be living by.

定理是數(shù)學(xué)的永久文獻。

The challenge of our time is to create a sustainable energy future.