In your document, click where the line should begin. Hold down the mouse button and drag to the point where you want the line to end. If you also hold down the Shift key, you can draw only horizontal, vertical, and diagonal lines.
在文档中单击以确定线条的起始位置。按住鼠标，拖到所需的线条结束位置处松开。如果同时按住 Shift 键，则只能绘制出水平线条、垂直线条和对角线条。