Zhìpǔyí kěyǐ fēnxī wùzhì de fēnzǐ liàng hé jiégòu.
A mass spectrometer can analyze the molecular weight and structure of substances.
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质 (matter/substance) + 谱 (spectrum) + 仪 (instrument) = an instrument that creates a spectrum of matter. The suffix 仪 is common for scientific instruments.
