重覆點擊 ▶▶ 鈕，看看如何構作以下圖形。
根據老師指示，構作這個圖形。
Click the button ▶▶ repeatedly to see how the following figure is constructed.
Construct this figure according to the teacher's instruction.
使用代數指令構作以下繡曲線圖形。Construct the following figures with algebraic commands.