瑞士法郎债券是指外国机构在瑞士发行的瑞士外国债券。
在日内瓦大学附属医院的瑞士病毒实验中心指导的一项研究里，研究人员做了个实验：让病毒附在瑞士法郎债券上，然后观察可能发生的事情。
In a study conducted at Switzerland's Central Laboratory of Virology at the University Hospitals of Geneva, researchers tested to see what would happen when flu virus was placed on Swiss franc notes.
购买外国债券(同时出售瑞士法郎)作为下一个增加流动性的步骤就顺理成章了。
Buying foreign bonds (and selling Swiss francs) is thus a logical step to expand liquidity.
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