这些物质,包括氨、二氧化碳、一氧化碳、钠时,让人吃惊的是,银,可能来自地球、月亮的内部,还是来自彗星和小行星。
The compounds, which include ammonia, carbon dioxide, carbon monoxide, sodium and, surprisingly, silver, could have come from the Earth, from the moon's interior, or from comets and asteroids.
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