tack [tæk]

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n.大头钉；假缝，粗缝

a small sharp nail with a flat end

He is hammering a tack into the wall to hang a picture. 他正往墙上钉一枚平头钉用来挂画。
We are going to tack the map on the wall. 我们打算把这张地图钉在墙上。