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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