The stars near the galactic center are like cosmic clocks, helping us map spacetime.

成功的衡量标准不仅是利润，还有积极的影响。

The American farmer is the only man in our economy who has to buy everything he buys at retail, sell everything he sells at wholesale, and pay the freight both ways.

睡得早起得早，使人聪明、富有、身体好。