北京
杆秤的结构非常简单，主要是一根刻有星度的秤杆、一个可以移动的秤砣，以及一个手提的提纽。正是这简单的三样东西，组合成了一个巧妙的称重工具。
The structure of the steelyard is very simple, consisting mainly of a marked scale, a movable counterweight, and a lifting cord. These three simple components come together to form a clever weighing tool.
它的核心是“找平衡”。称重时，物品挂在一边，秤砣在另一边移动。当秤杆变得水平不翘不落时，就说明两边的力量相等了。这时，读取秤砣对应位置的刻度，就能知道物品有多重。
Its core principle is "finding balance". When weighing, the object is hung on one side, and the counterweight is moved along the other side. When the scalepolebecomes perfectly level—neither rising nor falling—it means the forces on both sides are equal. At this point, reading the marking where the counterweight is positioned tells you the weight of the object.
杆秤的魅力在于“手动”的参与感。它没有电子屏幕，需要人们亲手操作并观察平衡，整个过程像完成一个有趣的物理实验，充满了互动性和智慧感。
The charm of the steelyard lies in the hands-on involvement it requires. Without an electronic display, it demands manual operation and careful observation of balance. The entire process feels like completing an interesting physics experiment, full of interactivity and intellectual satisfaction.
责编：玄贺彤
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