一本书就是装在口袋里的花园。
It was the best of times, it was the worst of times.
在科学的道路上,没有平坦的大道可走,只有不畏劳苦沿着陡峭山路攀登的人,才有希望达到光辉的顶点。
我越是工作,就越是以不同的方式看待事物。
The key is to keep improving, to keep working hard.