这些物种在其所处的小型生态系统中可能发挥着关键性的作用，一旦消失，即使还有许多相关的物种，也会导致整个生态系统发生改变。
Such species may be key to the survival of their small ecosystem and their loss, even among many related species, can alter an entire ecosystem.
该系统通过一个小型发电机（脉冲发生器）来产生电刺激以阻断大脑中的异常神经信号。
The Reclaim system uses a small electrical generator known as a pulse generator to create electrical stimulation that blocks abnormal nerve signals in the brain.
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