1. As a general rule, solids can expand and contract too. But the coefficients of expansion and contraction of solids are on the whole smaller than those of liquids. 
   通常固体也能膨胀和收缩，但是总的来说固体的膨胀收缩系数比液体小。
2. a painful and involuntary muscular contraction. 
   疼痛不是自愿的肌肉收缩。
3. An intense, paroxysmal, involuntary muscular contraction. 
   抽搐一种强烈的、阵发性的、不自觉的肌肉收缩
4. the contraction of a gas on cooling. 
   收缩可以使体积变小。
5. the contraction of two vowels into a diphthong. 
   把两个连续的元音或音节收缩或紧缩成一个双元音。

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• 1. 整体收缩
  Expansion 扩展...whole contraction 整体收缩...Optimal estimate 量优估计
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