新概念英語(yǔ)第四冊(cè)長(zhǎng)難句講解(5)

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【句型5】It is hard for us to realize nowadays how difficult it was for the pioneers. (Lesson 3)
    【譯文】如今我們很難理解登山先驅(qū)者昔日是多么艱苦。
    【講解】it是形式主語(yǔ),to realize nowadays how difficult it was for the pioneers是真正的主語(yǔ)。