Now Alfred began a long series of skirmishes -- and within a month the Danes had surrendered.

这时，阿尔弗雷德发起一连串小规模的进攻，结果不出一个月，丹麦人就投降了。

There has long been a superstition among mariners that porpoises will save drowning men by pushing them to the surface, or protect them from sharks by surrounding them in defensive formation.

长期以来，海员中流传着一种迷信的说法，认为海豚会把快要淹死的人托到水面，救人性命；或在人们周围列队保护，使他们免遭鲨鱼伤害。

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。

its action depends on the surface, water or ground, over which it rides.

它的飞行取决于它所悬浮的水面或地面。

An enterprise has to incur certain costs and expenses in order to stay in business.

一个企业为了继续经营，不得不支出一定的费用和开销。

no crowd or movement in which he may take comfort,

找不到伙伴和活动使自己得到安逸。