an electric saw (= a tool for cutting hard materials) that has a circular blade, sometimes with sharp points along the edge

Trim the posts to height with a circular saw. 用圆锯把木桩锯到合适的高度。

He could hear the sound of hammering, then the whine of a circular saw. 他能听到锤子敲打的声音，然后是圆锯的呜呜声。