atmosphere/air/surroundings/atom/atomic/nuclear/nucleus/molecule
记忆：
1. atmosphere [ 5AtmEsfiE ] at-mo-sphere at, 在；mo音“某”， sphere, 球体，地球；atmosphere, 趣味联想：在某地球处大气稀薄 n. 大气，气氛 The teacher was pleased to find the heated atmosphere at the discussion. 老师很高兴地看到讨论会上的热烈气氛。
2. air [ ZE] n. 空气，神气 When he put on airs, we felt disgusted. 当他装模作样时，我们都感到恶心。
3. surroundings [sE5raJndINz] sur-round-ings n. 环境 The surroundings are much better for our health now. 现在环境对我们的健康好多了。
4. atom [ 5AtEm ] n. 原子 The atom is not the smallest particle making up matters. 原子不是构成物质的最小微粒。
5. atomic [ E5tCmik ] adj. 原子的 An atomic bomb has an unimaginable destructive power. 原子弹有难以想象的破坏力。
6. nucleus [ 5nju:kliEs] n. 原子核 An atom is made up of a nucleus and some electrons surrounding it. 原子是由原子核和它周围的电子组成的。
7. nuclear [ 5nju:kliE ] adj. 核子的, 原子能的, 核的 The international community should have a strong control over nuclear weapons. 国际社会应该有力地控制核武器。
8. molecule [ 5mClikju:l, 5mEu- ] 分子 The molecules of air are much more active than the ones of liquid. 气体的分子比液体分子活跃得多。