The ones used at NewFusion cost around 100 euros each and are inserted between the thumb and index finger.

新融合公司使用的这种芯片每个大约售价100欧元，植入在拇指和食指之间。

youdao

He handed his cigarette to the guy next to him, made a circle with the thumb and index finger of one hand.

他把手里的烟递给旁边那个家伙，用一只手的拇指和食指画了个圈。

youdao

The A-Okay Joining the thumb and index finger in a circle is a popular way of saying Okay, but it is an insult in many Latin American countries.

Okay的手势把大拇指和食指连成一个圆形，是流行的表示“好”的手势，可在许多拉美国家，该手势却是对人的侮辱。

youdao

The contact in a good handshake should be the web of skin between the thumb and index finger.

FORBES: Holiday Office Etiquette: Getting Physical

The guitarist was recognised as much for his powerful, gruff vocals as his musicianship and was known for playing with picks on both the thumb and index finger of his right hand.

BBC: Magic Slim, American blues musician, dies aged 75

We didn't have to change our usual or "traditional" finger positioning, meaning we were able to keep our right thumb in the bottom left corner of the pad and use our index finger to navigate. (Even if our thumb moved slightly up on the pad it still worked.) Best of all, while using that finger positioning we rarely zoomed in on something by mistake.

ENGADGET: The Windows PC ClickPad finally improved? Synaptics ClickPad IS Series 3 preview