原文:Frogs are losing the ecological battle for survival, and biologists are at a loss to explain their demise.
译文:青蛙失去了生存下来的生态竞争能力,生物学家不能解释它们的死亡
题目:Biologists are unable to explain why frogs are dying.
译文:生物学家不能解释为什么青蛙死亡
解释:题目中的are unable to与原文中的are at a loss to 是同义词,题目中的why frogs are dying与原文中的their demise是同义词,所以答案应为True
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