When you've got to go, but you're out there in space, zipped up in a spacesuit, with no toilet in sight and a crew of other astronauts around, what do you do?  如果你在太空裹着宇航服时，迫切需要方便一下，但是周围看不到厕所又有一群宇航员在

China's first astronaut says he heard mysterious knocks during his first flight in space - but no one has been able to explain the cause of them.中国第一名宇航员称其第一次宇宙飞行时听到神秘的敲击声，但没有人能解释原因。Astronaut Yang Liwei

Itsreported that there are more than sixty million students and teachers watchedthe first space lecture hosted by Wang Y