组的成本一效果比更佳。

Group B was more cost effective.

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组的成本-效果比在3组中最佳。

Group B was most cost effective in 3 groups.

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研究人员说，这种巨型非洲囊鼠可以嗅出痰样本中的结核菌，比实验室里使用显微镜效果更好，而且成本更低。

Researchers say the sniffing powers of the African pouched rat can help detect TB in sputum samples more efficiently and at a lower cost than lab technicians using microscopes.

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