视频中展示了一双手正在使用直角尺和铅笔在木板上进行标记。手部动作细致，首先将直角尺的一边紧贴木板边缘，确保直角尺的另一条边与木板形成直角。然后，用铅笔沿着直角尺的边缘在木板上画出一条直线，作为切割或加工的参考线。整个过程显得非常专业和精确，背景是木质的工作台面，显示出这是一个木工操作的场景。
The video shows a person using a metal L-square ruler to measure and mark a piece of wood. The person holds the L-square ruler firmly against the edge of the wood, ensuring it is aligned correctly. They then use a pencil to draw a straight line along the edge of the ruler, marking the wood for cutting or further work. The process is done on a wooden surface, likely a workbench.
A person places a metal square ruler on a piece of light-colored wood, aligning it carefully. The person then uses a pencil to draw a line along the edge of the ruler, marking the wood. The person adjusts the ruler and draws another line, ensuring precision. Finally, the person removes the ruler, revealing two parallel lines on the wood.