additivity of mass spectra的用法和样例：
- The system can realize the rapid recording of mass spectra in transient processes and provide a covariance mapping through a large number of repetitive measurements (e.
- The fragmentation regularities of mass spectra of these compounds were studied by the magnetic and electric fields link scan and precise mass measurement.
- A metric unit of mass equal to 100 grams.
- automatic recording of mass spectra