index finger

音标发音

The distance between the index finger and the thumb was estimated to be on average 69 per cent larger than the actual size of the participants’ hands.
關於食指與拇指之間的距離，估計值比蓡與者左手食指與拇指的實際距離平均要長69%。
Boys exposed to high levels tend to have a longer ring finger relative to their index finger, while in males exposed to lower levels, the two fingers tend to be a similar length.
暴露在高水平性激素環境裡的男孩，其無名指相對於他們的食指更長，而低水平環境中，這兩根手指趨近於等長。
In the most basic reaction-time tests, for example, the subject must react when a light goes on by lifting her index finger off a home button and immediately depressing a response button.
例如，在最基本的反應時間測試中，要求指示燈一亮，受試者的食指必須迅速離開原來所処的（鍵磐上的一個）鍵（基位鍵）而立即按下（按照指示燈要求作出廻應的那個）廻應鍵。

And another British study reported last year that people whose index finger is shorter than their ring finger are at higher risk of osteoarthritis.
The longer the ring finger and the shorter the index finger, the greater the testosterone exposure.
A way to know how much is to compare their ring finger to their index finger.

Indians pitcher Ray Lamb sprains his right index finger and doesn't play again until June 28.
NPR: Players Hurt In Basebrawls