Please keep the cartons to 15kg each and metal-strap all cartons in stacks of 4.
请将每个纸箱重量限制在15公斤内,并将每4箱一组用铁条儿固定起来。
With the invention of writing, a great advance was made, for knowledge could then be not only communicated but also stored.
随着书写的发明,又迈进了一大步,因为这样一来,知识不仅能交流,而且能储存了。