行星际飞船也许需要比迄今人类已经乘坐过的低轨道和月球登陆舱更强的辐射防护。
Interplanetary spacecraft may require more radiation shielding than the low-orbit and lunar craft that humans have travelled in so far.
“阿波罗”任务中的月球登陆模拟器看起来像个飞行床架，梅尔罗伊说到，在训练中就被撞毁。
The lunar-lander simulators for the Apollo missions looked like flying bed frames, Melroy says, and all of them crashed during training.
它计划在2014年之前让太空人跨出太空舱，并且在2020年之前实现月球登陆。
It plans to send an astronaut into space by 2014 and a manned mission to the Moon by 2020.
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