spacex发射美军最先进的gps卫星-凯发k8官网

spacex发射美军最先进的gps卫星

文章来源：未知文章作者：enread 发布时间：2018-12-24 08:06 字体： [ ]　

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spacex has launched the u.s. air force's most powerful gps satellite ever built.

spacex公司将美国空军最先进的gps卫星送入太空。

a ¹ 9 rocket blasted off from ² canaveral, florida, on sunday, ³ the satellite into orbit.

the satellite was supposed to soar tuesday but rocket concerns and then weather delayed the flight.

heather wilson, secretary of the air force, says this next-generation gps satellite is three times more accurate than previous versions and eight times better at anti-jamming. it's the first in a series and nicknamed vespucci after the 15th-century italian explorer who calculated earth's ⁴ to within 50 miles (80 kilometers).

lockheed martin developed the advanced gps technology and is building the satellites at a facility near denver.

sunday's launch was space x's 21st and final launch of the year, a company record.

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收听单词发音

1
n.隼，猎鹰
参考例句：
the falcon was twice his size with pouted feathers.鹰张开羽毛比两只鹰还大。 the boys went hunting with their falcon.男孩子们带着猎鹰出去打猎了。

2
n.海角，岬；披肩，短披风
参考例句：
i long for a trip to the cape of good hope.我渴望到好望角去旅行。 she was wearing a cape over her dress.她在外套上披着一件披肩。

3
起重，提升
参考例句：
the hoisting capacity of that gin pole (girder pole, guy derrick) is sixty tons. 那个起重抱杆（格状抱杆、转盘抱杆）的起重能力为60吨。来自口语例句 we must use mechanical hoisting to load the goods. 我们必须用起重机来装载货物。

4
n.圆周，周长，圆周线
参考例句：
it's a mile round the circumference of the field.运动场周长一英里。 the diameter and the circumference of a circle correlate.圆的直径与圆周有相互关系。

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