He was quite unable to reproduce the same movement.
他不能复制同一个动作。
Researchers say that some years these birds are completely unable to reproduce.
研究员们说过些年这些鸟将会完全的失去繁殖的能力。
Thsy were unable to reproduce the results of the first experiment when they repeated it.
他们在做这个实验的时候,得不出第一次实验的结果。
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