But the mutable tubercle bacillus proved an elusive target, becoming resistant to each successive drug tried.

易变的结合杆菌是个难以攻克的目标，它对当时试用的每种药物都产生了耐药。

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But the mutable tubercle bacillus proved an elusive target, becoming resistant to each successive drug tried.

易变的结合杆菌是个难以攻克的目标，它对当时试用的每种药物都产生了耐药。

youdao