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He affixed the picture to the wall with a thumbtack.

他用图钉把图片钉到墙上。

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I press the thumbtack into the board with thumb.

我用大拇指将图钉按在木板上。

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"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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