creature's only opportunity
definitions
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The single chance or possibility available to a living being to achieve something, survive, or escape a situation.ja: 生物の唯一の機会
examples
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The small animal realized that the opening in the fence was the creature's only opportunity to escape.
その小さな動物は、柵の隙間が逃げるための唯一の機会であることに気づいた。