Even the modern approach, in which the subject's finger is rolled over a glass plate for scanning, often requires several attempts per finger to get a usable print.

甚至现代的方法(用这种方法扫描时，被测人员要在一块玻璃板上转动手指)，往往需要对每根指头采集多次，才能获得一个可用的指纹。

youdao

The boy is putting the plate on his finger.

这个男人正把盘子放在他的手指上。

youdao

I burned my finger on the plate.

我的手指被盘子烫到了。

youdao

He sets the items on a three-tiered silver plate, with finger sandwiches on the bottom and the top two layers with sweets.

WSJ: Tricks of the Trade: The Modern Tea Party