Your most unhappy customers are your greatest source of learning.

诗歌是表达不可言说之物的艺术。

Innovation in quarrying isn't just about new machinery; it's about reimagining our relationship with the earth we extract from.

做伟大的事情很困难，但指挥伟大的事情更困难。

I never wanted to be a rock star. I just wanted to play music.

我永远感激我的贫苦父母。我欠他们一切，无论是我的教育、我的生命，还是我取得的任何成功。

解释：货卖完了才知道不足，是由于不懂得计量；事情结束了才知道有余，是由于不懂得调节。