Clide
放射性核素浓度
🗣️ 情景例句
You came very close, Ellen.
差了一点点， Ellen。
We must get back to first principles.
我们必须回到基本原则上来。
But even in the most favourable circumstances only a small fraction of the creatures that die are preserved in this way before decay sets in or, even more likely, before scavengers eat them.
即使是在最有利的环境中，死去的生物中也只有一小部分能在开始腐烂前，或更可能在被食腐动物吃掉之前，被这样保存下来。