有意栽花花不发，无心插柳柳成阴。
用心栽花、施肥、灌溉，花却总是不开；无意间将柳条插在地上，却长成了郁郁葱葱的柳树。
They had said that the city was a paradise, but I found it a hell.
In the midst of winter, I found there was, within me, an invincible summer.
可持续发展要求我们在经济增长和环境保护之间取得平衡。