Although the cartons are light and easy to handle, we think it is not strong enough to be shipped.
虽然这些纸箱轻便、易拿,但我们认为它们在运输中不太结实。
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。