And so in the mass spectrum, it doesn't matter if experts don't have to say in advance what molecule they are looking for.

因此，在质谱中，专家无需事先指定要寻找的子。

This valuable information was  obtained from the CDA mass spectrum analysis of over 300 ice grains from the E-ring.

这些宝贵的信息来自对E环中超过300颗冰粒的宇宙尘埃仪质量谱。

The instrument then separates the plasma components and analyzes the resulting mass  spectrum of the ions produced by the impacting dust particle.

然后该仪器离等离子体成，并由撞击尘埃粒子产生的离子的质量谱。