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。
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.
还有一些将作为地球高轨上的哨兵来确定危险入侵者距离我们这个星球的准确位置。
Still others would stand as sentinels in high earth orbit to spot dangerous intruders from our star.
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