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Erduo in Tibetan refers to trebuchet which is a kind of tool to graze. It is usually more than one meter long. A trebuchet works by using the mechanical advantage principle of leverage to propel a stone or other projectile much farther and more accurately than a catapult, which swings off the ground. The sling and the arm swing up to the vertical position, where, usually assisted by a hook, one end of the sling releases, propelling the projectile towards the target with great force.
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