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个人理解.关键在于理解S的话.unless....I will...
S只是一种假设,如果不采取措施,我就转学.(隐含:如果采取措施了,我就不转学.注意,这里S的论点是两个方向都有可能.)
B:陈述的是个事实.没有采取措施. 则S会转学.并不能够成假设.
B取非的话:已经采取措施了(则S不用转学了)对S的论点(如果采取措施了,我就不转学.)够不成削弱.
关键是理解unless...i'll包含两个方向的意思..是个条件句.
大家指正.
E is the key. If we negate E, the conclusion cannot hold -no matter what happens, the transfer does not make sense.
B is part of the conclusion: it could be true, could be not. Either status leads to different outcome.
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