第一组人员每周绕一条跑道走三圈，每次持续40分钟的时间；第二组人员从事一系列少氧锻炼，包括瑜伽和阻力带训练。
One group walked around a track three times a week, building up to 40 minutes at a stretch; the other did a variety of less aerobic exercises, including yoga and resistance training with bands.
氧原子有轻微的负电荷，而氢原子则带对应的正电荷。
The oxygen atom has a slight negative charge while thehydrogen atoms share a compensating positive charge.
今年3月，通过对冰岛一带贝壳的研究发现，其硬壳氧同位素的水平会随水温的变化而产生差异。
A study this March of clamshells taken from Iceland found that the levels of oxygen isotopes in the shell layers varied depending on the temperature of the water in which they formed.
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