改变始于一小步,但需要集体的努力才能使其持久。
Change starts with a single step, but it takes a collective effort to make it lasting.
The world is full of people who have never, since childhood, met an open doorway with an open heart.
这个世界上充满了自童年以来从未以开放的心态迎接开放之门的人。
化学工业是现代文明的支柱,我们必须以应有的责任感对待它。