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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A 2020 target for cutting emissions is even more important but elusive.

截至2020年的减排目标尽管更加重要却也更加模糊。

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The first detailed images of an elusive drug target on the outer wall of bacteria may provide scientists with enough new information to aid design of novel antibiotics.

首次发现作用于细菌外壁令人琢磨不透的药物靶点详尽图像给科学家提供足够的新信息以帮助设计新型抗生素。

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Now Slim works on acquiring another elusive target: the love of his people.

FORBES: The World's Richest People

And terrorism is the most elusive target imaginable.

ECONOMIST: Lexington

Slim Jim's target consumer niche is the elusive 18- to 29-year-old guy.

WSJ: Krave, Perky Jerky and Others Remake Beef Jerky as a Healthy Protein Snack