翻译：对中国学生来说，英语中的双元音（diphthong）很难掌握。
For the Chinese students that the diphthong of the English is problematic .
参考翻译：English diphthongs are particularly problematic for Chinese students to master
造句：西游记中师徒四人西天取经真是困难重重。
In the Journey to the west learn from the west has been problematic for the four mentoring.
形容词：困难重重
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