Forefinger index finger
n. 食指
🧩 词语组成解析
index
['ɪndɛks]
n. 索引;<数>指数;指示;标志;
vt. 给…编索引;把…编入索引;[经济学]按生活指数调整（工资、价格等）;
vi. [机械学]转位;
in(in)+dex(proclaim)→指针；索引；指数；食指；指标
finger
['fɪŋɡɚ]
n. 手指;指状物;指针;
vt. 伸出;告发;用手指触摸;
vi. 用手指触摸;拨弄;
🗣️ 情景例句
Here's a brief description
这是一份简单的记录
I'd like to make an appointment with Professor Smith. Would 9:00 tomorrow be all right?
我想和史密斯教授约个会面时间。明天9点行吗？
and by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
测出回声间隔的时间，便可算出该处海洋的深度。