A space plane is different from an ordinary plane.

航天飞机与普通飞机不同。

The orbital space plane promises to be much safer than the shuttle.

轨道太空飞机应该较太空梭来得安全。

The Pentagon has repeatedly said that the space plane is simply a “test bed” for other technologies.

五角大楼曾多次表示，空天飞机仅是一个技术“试验床”。

The 29-foot-long space plane, much smaller than the space shuttles, can stay in orbit for up to nine months.

这位29英尺长的空天飞机，比航天飞机更小，可以留在轨道上长达9个月。