Writing at the beginning of the 17th century, Francis Bacon, an English philosopher of science, maintained that the three most important inventions were gunpowder, the magnetic compass and printing.
弗朗西斯·培根，一位英国科学哲学家，在17世纪初强调说三项最重要的发明是火药、罗盘和印刷术。
This lesson chiefly describes several essential problems of writing an application document for magnetic fertilizer.
这一讲着重介绍了磁化肥料发明申请文件撰写的几个基本问题。
The process of writing patterns of data on top of the data stored on a magnetic medium for the purpose of obliterating the data.
为永久删除数据，在已经记录数据的磁介质上再写入其他样式数据的过程。
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