食指的英文：
forefinger
index finger
pointer finger

参考例句：
  • the apposition of thumb and forefinger
    大拇指与食指并列
  • The little child took her ear between her thumb and forefinger and tugged it playfully.
    小孩用大拇指和食指捏住她的耳朵，拉着玩。
  • His hand went into his pocket and a forefinger felt its way under the flap of the envelope, ripping it open in jerks
    他把手伸进兜里，一只食指摸索到信封的口盖，分几截把信扯开了。
  • The thumb is opposable to the forefinger.
    大姆指可与食指相对。
  • His finger has swelled up.
    他的食指肿起来了。
  • To shoot(a marble)with the thumb over the bent forefinger.
    弹玻璃弹子拇指在弯曲的食指上方射出(弹子)
  • The competitor's fingers shall be outside the trigger guard while reloading.
    因此在重新装填弹药时选手的食指一定要置于扳机护弓之外。
  • With your right hand lightly grasp the grip and place your index finger lightly over the shutter button.
    用您的右手轻轻握住相机手柄，并把您的食指轻轻地放在快门按钮上。
  • You distance all rivals, and may soon touch the sky with your forefinger
    你把一切敌手都远远抛在后面，不久就能用你的食指触着天了。
  • Also, Americans often indicate "OK" with their thumb and forefinger touching to form a circle
    还有，美国人通常用大拇指及食指环绕起一个圆圈表示「没问题」。
forefinger是什么意思：
n.食指
  • He held it between the tips of his thumb and forefinger.
    他用他大拇指和食指尖拿着它。
  • He hold it between the tips of his thumb and forefinger.
    他用大拇指和食指尖拿著它。
  • To shoot(a marble)with the thumb over the bent forefinger.
    弹玻璃弹子拇指在弯曲的食指上方射出(弹子)
index是什么意思：
n. 索引；指数；指标；指示
v. 做索引，编入索引中；按生活指数调整
  • The simplest form of a composite index is an unweighted aggregates index
    综合指数最简单的形式是不加权数的总计指数。
  • Social Sciences Citation Index
    社会科学引文索引
  • The radius represents the advancement index.
    辐枝代表进化指数。

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