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It  should  be  observed  that  sentences  occur at first sight similar  to those  condemned,  but  with  the difference  that  another  purpose  is served  by  that instead  of or  as well as  that  of  heralding  the  participle

請問老師這個句子的結構是怎樣的呢？這是it句后邊跟兩個that句子嗎?

如果是，那with the difference是什么成份，作何解釋呢？

謝謝！