只有当粒子紧密到能够相互施加较大的力时，它们才能使彼此产生这样的振动。

It is only when particles are close enough to exert relatively large forces on one another that they are able to set each other into this type of vibration.

youdao

只有当粒子紧密到能够相互施加较大的力时，它们才能使彼此产生这样的振动。

It is only when particles are close enough to exert relatively large forces on one another that they are able to set each other into this type of vibration.

youdao