1. Too great a variation of amplitude in either temperature or humidity will aggravate the periodic contraction and expansion of the surface of rock. 
   温、湿度变化振幅过大，会加剧岩壁表层周期性收缩膨胀；
2. rock and rock mass 
   岩石和岩体
3. a painful and involuntary muscular contraction. 
   疼痛不是自愿的肌肉收缩。
4. 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
5. the contraction of a gas on cooling. 
   收缩可以使体积变小。

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