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自从神舟飞船成功发射以来,我国的载人航天计划的进程也在加速。美国是航天大国,其载人航天计划很早就已经开始了,并且有了很丰富的经验,让我们来看一看这些年美国在载人航天方面都做了哪些事情:
Since the successful launch of the Shenzhou spacecraft, the progress of China's manned space program has also accelerated. The United States is a space power and its manned space program has long been started and has a wealth of experience. Let us take a look at what the United States has done in manned space over these years: