The form scissor is used as a modifier. scissor 用作修饰语。
N-PLURAL 剪刀;剪子 Scissors are a small cutting tool with two sharp blades that are screwed together. You use scissors for cutting things such as paper and cloth.
He told me to get some scissors... 他让我去拿把剪刀。
She picked up a pair of scissors from the windowsill. 她从窗台上拿起一把剪刀。