Tail Guard 拖剑劈砍 ; 尾部护罩
train-tail safty guard 列车尾部安全防护装置
And there was a Greek story to the effect that the sentinels at the siege of Troy changed their guard according to the vertical or horizontal positions of the tail of the Great Bear.
从前有个希腊故事，大意是说，哨兵们包围特洛伊城后，根据大熊星星尾的垂直或水平位置改变其守卫战略。
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