四肢乏力 meaning in Chinese

lassitude of the extremities

My limbs lost their stiffness , as if liquefying , and my body struggled for a moment to remember how to be a body
我觉得四肢乏力，就好像溶化了一般，我的身子挣扎了好一阵子才站稳。
My feet they are sore , and my limbs they are weary ; long is the way , and the mountains are wild ; soon will the twilight close moonless and dreary over the path of the poor orphan child
我的双脚酸痛啊四肢乏力，前路漫漫啊大山荒芜。没有月光啊天色阴凄，暮霭沉沉啊笼罩着可怜孤儿的旅途。