求翻译：The Changdao is a Chinese swordsman unit that wields a long, straight blade, making it powerful against cavalry. The long sword known as "changdao" was actually a Chinese modification of a Japanese design carried by wokou pirates of the sixteenth century. The famed Chinese pirate fighter, General Qi Jiguang, is said to have taken the existing Japanese odachi sword, lengthened it, and straightened its curve, creating a blade that was over three feet long and ideal for repelling cavalry.是什么意思？

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