<正> 首先请看几个例句: a. If I have seen further than most men it is bystanding on the shoulders of giants. (Issac Newton) b. If I am a janitor it is either because I have to bea janitor or I want to be a janitor. (J. A. Mcpherson,'Gold Coast', 1968) c. But if he was ever happy it was in these first tenyears in Vienna, when he was gradually establishing