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图１ Ｘ－３７将是Ｘ系列试验机中第一种在轨进行试验的试验机美国航宇局和波音公司最近签署了一项为期４年的协议，将建造一架Ｘ－３７可重复使用运载器，并在轨道上进行试飞，以验证范围广泛的多项技术。这些新技术最终有可能把每磅（１磅约合０．４５４公斤）有效载荷的发?
Figure 1 X-37 to be the first test rig to be tested on-orbit in the X-Series testing machine NASA and Boeing recently signed a four-year agreement to build an X-37 reusable Carrier, and on-orbit test flight to verify a wide range of technologies. These new technologies eventually have the potential to put a payload of 1 pound (about 0.454 kg)