index fingers
释义
食指：手指中的第二根，通常用于指向或触摸物体。
例句
1·Gently squeeze it between thumb and index fingers .
用拇指和食指的之隙挤捏它。
2·Keep the thumbs and index fingers pressing into the floor.
大拇指和食指用力下压。
3·Use index fingers to guide floss between contacts of the lower teeth.
使用食指之间的指导下排牙齿接触的牙线。
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