The thumbtack pricked his index finger.
大头针扎了他一下手指。
I press the thumbtack into the board with thumb.
我用大拇指将图钉按在木板上。
He affixed the picture to the wall with a thumbtack.
他用图钉把图片钉到墙上。
"Ouch!" cried the principal. "There is a thumbtack in this chair!"
“哎呦！”校长叫道，“这把椅子上有个图钉！”
"Ouch!" cried the principal. "There is a thumbtack in this chair!"
“哎呦！”校长叫道，“这把椅子上有个图钉！”
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