The form scissor is used as a modifier. scissor 用作修饰语。
N-PLURAL [oft a pair ofNOUN]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. 剪刀;剪子
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.