例文
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- Air, soil and water contain mostly oxygen 16 ( 16 O ).
- Because oxygen 16 is lighter, water molecules that contain it evaporate more readily.
- Water contains both oxygen 16, which is common, and the heavier isotope oxygen 18.
- Jahren's analysis of the wood suggests that the water contained almost exclusively oxygen 16.
- Further studies were carried out with Oxygen 16 and Iron 56, and these experiments also showed the same short tracks.