Auto and To Be on Pins and Needles

I. ROOT 詞根 :  “auto”  by yourself, working without help自己的；本身的；自己做的；自動的

            1. automatic自動的；自動化的

            2. automobile/ an auto 汽車

      3. an autofocus camera自動對焦相機

4. an auto-immune disease自身免疫疾病

II. IDIOM成語 : To Be On Pins And Needles:
Anxious or nervous, especially in anticipation of something. 如坐針氈，焦慮不安，急得要命

Pins別針，大頭針

Needles針，縫衣針

EX: He is on pins and needles this week because of his exams.