rope "绳索"这个意思的时候既是可数名词又是不可数名词。

I attempted walking along the rope.

我尝试沿著这绳索走。

Steel cable will be used to replace worn ropes.

将用钢缆替换磨损的绳索。

He twisted the three ropes to make one very strong rope.

他把3根绳子搓成一根非常结实的绳子。