fission
n[U]
1 splitting of the nucleus of an atom with the release of a large amount of energy 裂变: nuclear fission 核裂变.
2 (biology 生) splitting or division of biological cells as a method of reproduction 分裂生殖.
It's quite simple. You put a very hot, wet cloth on your shoulder for one minute. Then put a packet of frozen peas on the shoulder for one minute. And so on and so on.
很简单。你把一块很热的湿布敷在肩膀上一分钟。然后把一包冻豌豆敷在肩膀上一分钟。这样反复几次。
Their population has now increased to 435,000, and today they make up about 13% of the population.
不过现在他们的人口已增长到435,000人,如今他们已占全国人口的13%。
4 Think of a time when you were happiest. What were you doing?