第六类

285.The new age of machinery, in short, could not have been born withouta new source of both movableand constant power.

286.Of course, the contrast is not quite so stark: in Alexander the Great theGreeks had found the greatestterritorial conqueror of all time; and theRomans, once they movedoutside Italy,did not fail to learn the lessons ofsea power.

287.It would therefore not be too great an exaggeration to say thatpractitioners of the fine artswork to overcome the limitations of theirmaterials, whereas thoseengaged in the applied arts work in concert withtheir materials.

288.Their streamlined bodies, the absence of hind legs, and the presenceof a fluke1 and blowhole2cannot disguise their affinities with land dwellingmammals.

289.It appears that unlike salt, dissolved organic substances are notexcluded from the ice in thefreezing process.