New Words：

forefinger [ˈfɔːrfɪŋɡər] n. 食指
bulb [bʌlb] n. 电灯泡

Sample Sentences：

I put my left forefinger to my mouth.
Point at your nose with your forefinger.

How much does it cost to change a light bulb?
Could you change the bulb in the kitchen lamp, please?

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