当水从海洋表面蒸发时，往往会留下较重的同位素，所以剩余的海水会逐渐富含氧18这种同位素。
Heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18.
渡边刚表示，这些同位素比例为珊瑚生长环境的海水温度及盐度情况提供了线索。
Those ratios provide clues about the temperature and salinity of the water in which the corals were immersed, Watanabe says.
三叠纪是地球环境的重大变革时期，海水锶同位素组成的研究也较为困难。
Triassic is a period with a great change in global environment, so it is more difficult to study its strontium isotopic composition of seawater.
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