Everyone is a moon, and has a dark side which he never shows to anybody.
比如說(shuō)，你下午四點(diǎn)鐘來(lái)。那么從三點(diǎn)鐘起，我就開(kāi)始感到幸福。時(shí)間越臨近，我就越感到幸福。到了四點(diǎn)鐘的時(shí)候，我就會(huì)坐立不安：我就會(huì)發(fā)現(xiàn)幸福的代價(jià)。
Efficiency in extraction is meaningless if we don't consider the long-term impact.