物种一旦消失就再也找不回来了，随物种一同丢失的可能还有某种疾病的治愈之法、对进化史的新见解、生态链中的其他关键角色等等。
Species can be lost forever, and with it, possible cures for disease, insights into the history of evolution, critical members of ecosystems.
指定在给定链路上丢失的数据包数。
Specifies the number of packets that are lost on a given link.
滤除这些噪声将导致滞后反应，较高的信元丢失和较低的链路利用。
Filtering out the noise will lead to sluggish response, with higher cell loss and lower link utilization.
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