标签：太空英雄 相关文章
It may sound silly, but its really a good question, because weightlessness does make a visit to the latrine a tricky proposition. Weightlessness poses two main problems in the bathroom. The first is that an astronaut could drift away from the bowl at
发表于:2018-12-31 / 阅读(58) / 评论(0)
英语听力文摘 English Digest
英语听力文摘 English Digest