主句中的主语it是一个开工主语,其具体的内容应该是从to learn开始一直到句子结束的长达八行的不定式,但是此不定式实在太长,如果放在句首则句子无法平衡。Learn后面带着两个以that引导的宾语从句,中间以分号和and分开,可以把分号以后的句子看成是and it may come as a shock to mathematicians to learn that的省略形式。
意群训练:Thus, for instance, it may come as a shock to mathematiians to learn that the Schrodinger equation for the hydrogen atom is not a literally correct description of this atom, but only an approximation to a somewhat more correct equation taking account of spin, magnetic dipole, and relativistic effects; and that this corrected equation is itself only an imperfect approximation to an infinite set of quantum field-theoretical equations.
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