"Weakness in the lower right extremity" is a common way to describe the feepng of having difficulty moving or feepng weak in the lower right leg.

There could be several potential causes for this weakness, including nerve damage, muscle weakness or atrophy, or problems with the blood flow to the leg. It could also be a sign of a more serious underlying condition, such as multiple sclerosis or a stroke.

Here are some example sentences using this phrase in Engpsh:

"I've been experiencing weakness in my lower right extremity for the past few days. It's been difficult to walk or stand for long periods of time."
"The doctor said the weakness in my lower right extremity is pkely due to a nerve issue."
"I've noticed that my lower right extremity feels weak and numb when I sit for too long. Is this something I should be concerned about?"

中文翻译:

"我最近几天右下肢活动无力,很难走路或站立很长时间。"
"医生说我右下肢活动无力可能是由于神经问题。"
"我发现当我坐得太久时,右下肢感觉无力和麻木。这是件值得担心的事吗?"