We have several package tours you may choose, from ten days to three weeks in Europe.
我们有几套欧洲旅游计划选择,时间从10天到3个星期。
Libraries made education possible, and education in its turn added to libraries: the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the invention of printing.
藏书使教育成为可能,而教育反过来又丰富了藏书,因为知识的增长遵循着一种“滚雪球”的规律。印刷术的发明又大大提高了知识增长的速度。