然而，大约在同一时间，科学家们意识到彗星可能含有衰变的放射性同位素，这些同位素可能使彗星内部的温度升高到导致内部进化的温度。
About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve.
大约在同一时间，美国有了自己的空间站，叫做天空实验室号。
At about the same time, the United States had its own space station, called Skylab.
在他5岁的时候，他的弟弟去世了，大约在同一时间，查尔斯开始失明。
When he was 5 years old, his younger brother died, and around the same time, Charles started to lose his sight.
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