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One may as well not know a thing at all as know it but imperfectly. 39. have only to do结构，此结构表示只须(消)就能的意思。 We have only to turn to that extraordinary discovery made by Edison to see the significance of it. 40. not (no) unless句型 No increase in output can be expected unless a new assembly line is installed. 41. betterthan句型 Better my life should be ended by their hate， than that hated life should be prolonged to live without your love. 42. as it were是一个非常常用的插入语，意思是好象，可以说等。 Apiece of iron near a magnet， though apparently separate from it ， feels， as it were， the threads of this attachment. 43. 复杂结构，在下面例句中，由于anyone的定语从句过长，把谓语must realize提到定语从句之前。 Though faith and confidence are surely more or lass foreign to my nature， I do not infrequently find myself looking to them to be able， diligent， candid， and even honest. Plainly enough， that is too large an order， as anyone must realize who reflects upon the manner in which they reach public office. 44. notany more than为：不能，正如不能. One cannot learn to sketch and express himself graphically only by reading about it any more than one can learn to swim while standing by the pool. | 
