真正的科学首先教会人怀疑与承认无知。
All changes follow a law.
译文:年纪大了经不起生死离别,在异乡的日子里眼泪总打湿衣裳。
The act of writing is an act of optimism. You wouldn't take the trouble to do it if you felt it didn't matter.
The leather industry must evolve to meet both environmental standards and consumer expectations without compromising quality.