solid borne vibration

例句：

1. 1. The structure of the crystal is very solid.
   这种晶体的结构非常坚固。
2. 2. The molecule is composed of many solid atoms.
   这个分子由许多固体原子组成。
3. 3. The solid state is a phase in which matter remains unchanged.
   固态是物质保持不变的状态。