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suplex springs are energy accumulators; they store energy but cannot release it slowly. To achieve slow release, a "spring + high gear ratio mechanism" is required, commonly seen in mechanical watches. Helical springs have been applied since ancient times; bows and crossbows are two broad types of helical springs. By appearance, they can be divided into standard cylindrical helical springs and variable-diameter helical springs (see figure); by helix direction, they can be divided into left-hand springs and right-hand springs. Cylindrical helical springs have a simple structure, are easy to manufacture, and are the most widely used. Their characteristic curve is