撞击熔融物 meaning in Chinese
impact melt
Examples
- Scientists know that spa must be older than any other lunar basin , and the oldest of the basins that can be reliably dated from impact - melt samples is mare serenitatis , which is estimated to be 3 . 87 billion years old
科学家知道spa盆地必定比其他所有月球盆地古老，而目前能由撞击熔融物样本确实定年的最古老盆地是澄海，估计其年龄为38 . 7亿年。 - Radioisotope dating of the impact - melt samples ? rocks that melted when an asteroid or comet struck the moon , therefore revealing when an impact occurred ? shows that all these basins formed in a narrow interval between 3 . 9 billion and 3 . 8 billion years ago
利用放射性同位素为撞击熔融物（在小行星或彗星撞击月球时熔化的岩石，因此它们能显示撞击发生的时间）定年，显示这些盆地都在39 ~ 38亿年前一个很短的时间内形成。