His left forearm and three fingers on his right hand were amputated-the thumb, index, and middle.

他的左前臂和右手的三个手指：拇指、食指和中指，被截肢。

youdao

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