1. displacement of spectral line 
   谱线位移
2. reciprocal theorem of displacement 
   互等位移定理
3. stress functions and displacement functions 
   应力函数和位移函数
4. measurement of ground settlement and horizontal displacement 
   地面沉降和水平位移观测
5. He went to the parapet and leaned over. 
   他走到栏杆边，弯身俯视。

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