这些就是目前的原理，迄今为止，除了一些在低海拔的飞行测试，唯一的平流层测试是涉及一个按比例缩小拴在气象气球上的模型。
That is the theory, at least. So far, apart from some low-altitude test flights, the only stratospheric tests have involved a scaled-down version tethered to a weather balloon.
这个气球飞入平流层，并最终炸开。
The balloon soared into the stratosphere and eventually burst.
目前对飞船只进行了一些低海拔的飞行测试，平流层的测试则仅仅是由气象探测气球负载着规模缩小的模型原型机来进行的。
So far, apart from some low-altitude test flights, the only stratospheric tests have involved a scaled-down version tethered to a weather balloon.
然而充氮气的气球定期的发动它的动力装置升高到平流层。
Although helium-filled weather balloons regularly launch instruments high into the stratosphere.
平流层：罗伯特·哈里森将一台佳能SureShot相机固定在聚苯乙烯盒中并将盒子绑在氦气球上，仅凭此他捕捉到了上面这样的地球图像
Stratospheric: Robert Harrison captured images of the Earth like this one using a Canon Sure Shot camera fixed in a polystyrene box and attached to a helium balloon
什么是“平流层”气球？
什么是“平流层”气球？
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