可持续发展不是一种选择;它是我们对后代的责任。
努力的痛苦是暂时的,但不尝试的遗憾是永恒的。
Do not think it worthwhile to produce belief by concealing evidence, for the evidence is sure to come to light.
欲望使人即使到了天堂也会坐立不安。