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
Only when particles are close enough to exert large forces on each other can they cause each other to vibrate in this way
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
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