题目内容
在全球任意位置的用户在任何时候至少能同时观测到仰角大于5°的 ________ 颗卫星。At least_____satellites with an elevation greater than 5 degrees can be observed at any time by users at any position in the world.
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GPS可在全球范围内全天候地为海上、陆上、空中和空间的用户提供连续不断的、高精度的三维________ 、________ 和________ 信息。GPS can provide continuous and high-precision three-dimensional______,_______and_______information for users at sea, land, air and space all-weather in the world.
郑和 “宝船”是当时世界上最大的海船Zheng He's "treasure ship" was the largest ship in the world at that time
Spain was called a sea coachman from the end of the 16th century to the mid-17th century 西班牙在16世纪末-17世纪中期被称为海上马车夫。
Zheng He's voyage to the West is an unprecedented feat in the history of world navigation, more than half a century earlier than that of European navigators. 郑和下西洋是世界航海史上空前的壮举，比欧洲航海家的远洋早半个多世纪。
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