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
只有当粒子靠得足够近，能够对彼此施加相对较大的力时，它们才能使彼此处于这种振动状态
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
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。
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