They have difficulty walking or moving.

他们行动困难。

youdao

I find difficulty walking in certain weathers nowadays because I get arthritis.

我有关节炎，有些天气下，走路困难。

youdao

Imagine having difficulty walking, let alone exercising, because of pain and misshapen bones.

想象一下，连走路都有困难，更不要说锻炼，因为疼痛和骨骼变形。

youdao

These include trouble walking, weakness especially on one side of the body, difficulty seeing and difficulty speaking.

VOA: special.2009.08.12

He returned to Oxford, walking with difficulty because of what he said was a "war wound."

VOA: special.2010.01.03

They also include difficulty moving or keeping balanced while walking or standing.

VOA: special.2010.11.02

The 28-year-old said his right leg was left severely bruised below the knee and behind it and that he had difficulty walking for two months afterwards and that it had left him emotionally scarred.

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When I was first rushed to the emergency room, doctors were unsure what to make of my sweats and momentary difficulty in walking.

NPR: A Stroke Couldn't Stop Gerald Ford

The DfT guidelines state medical conditions such as autism do not qualify someone for a badge unless "they are unable to walk or have very considerable difficulty in walking".

BBC: Berkshire autistic boy's mum refused blue badge