素描术

例句：

1. 1.He drew a quick sketch of the landscape before heading out.
   他在出发前快速画了一幅风景素描。
2. 2. The artist used a pencil to sketch the figure on the canvas.
   艺术家用铅笔在画布上勾勒出人物轮廓。
3. 3. She sketched the design on her notebook before leaving the office.
   她在离开办公室前在笔记本上草绘了设计图。