Profitability and sustainability must go hand in hand—they are not mutually exclusive.
The secret of life is not just to survive, but to thrive with passion, compassion, humor, and style.
生命的秘密不仅仅是生存,而是以激情、同情、幽默和风格茁壮成长。
估计问题的性质不同。在这里,我们不关心检验特定的假设,而是关心估计参数的值。
The best illustrations are those that leave room for the reader's imagination.