表明这一迹象的是撞击掀起的尘土中显示的红外线光谱中的一些谱线，其频率与水分子能量激发时所发出光线的频率相应。
The telltales are specific "lines" in the spectrum of infra-red light from the plume. These correspond to the frequencies of light given off when water molecules are energetically excited.
撞击自鸣噪声是物体受到撞击时，被激发起的振动所辐射的声音。
Ringing noise is radiated by the vibrational parts when they impact with each other.
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