forefinger [ˈfɔ:fɪŋgə(r)]

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n.食指

the finger next to the thumb

He pinched the leaf between his thumb and forefinger. 他将叶子捏在拇指和食指之间。
He held it between the tips of his thumb and forefinger. 他用他大拇指和食指尖拿着它。