shake amplitude

例句：

1. 1. The old tree shook violently in the wind.
   这棵老树在风中猛烈地摇晃。
2. 2. The earthquake caused the buildings to shake.
   地震导致建筑物摇晃。
3. 3. The baby started to shake with fear.
   宝宝开始因恐惧而颤抖。