1) 翻译:对中国学生来说,英语中的双元音(diphthong)很难掌握。
English diphthongs are particularly problematic for Chinese students to master.
2) 语境:对于很多英语学习者来说,最大的问题是流利地使用英语进行口头交流。
Communicating in English fluently has been highly problematic for most learners.
3) Some places are more problematic than others for women traveling alone.
对那些独自旅行的女性来说,在有些地方遇到的问题会比其他地方更多。
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