The advantage of the balloon is that it will be cheaper than a space plane or rocket.
气球的优点是它比航天飞机或火箭便宜。
Ultraviolet sensitive photocathodes are also used in cameras in rocket and balloon-bome experiments.
火箭和气球实验的电子照相机中，还使用紫外敏感的光电阴极。
Ultraviolet sensitive photocathodes are also used in cameras in rocket and balloon-bome experiments.
火箭和气球实验的电子照相机中，还使用紫外敏感的光电阴极。
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