记忆单词有困难 用英语怎么说，写作文啊快

have difficulty in remembering words

记忆单词有困难

have difficulty in 
doing sth.  对…有困难；在某方面有困难

句子：

• They can see things that are far away,but they have difficulty in reading a book unless they hold it at arm's length.

  这些远视的人们能看清远处的东西，但是他们读书却很困难，除非他们把书举到一臂远的距离处去看。
                                       

• The patient was perceived to have difficulty in standing and walking.

  据观察所见, 病人站立和行走都有困难.
                     

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