After each extraction, we purified the resulting gas and passed the xenon into hohenberg 's mass spectrometer, which indicated the number of atoms of each isotope present.

每一次萃取后，我们把得到的气体纯化，再将氙通入霍恩·柏格的质谱仪，测量出其中所含各种同位素的原子数量。

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What book do the Prince of Wales, the Grand Duke of Luxembourg, Princess Patricia von Hohenberg of Austria, Queen Noor of Jordan and Prince Bernhard of the Netherlands all have in their libraries?

FORBES: Hint: It costs $2,900, and a seabird is the main character.