灭绝率

expiration dates───失效期；截止日期

attrition rates───[军]损耗率；退学率

extinctions───n.[生物]灭绝（extinction的复数）；消失；废除

extraction fans───排气风扇；抽风机

infection rates───感染率

reaction rates───反应速率

utilization rates───利用率（utilizationrate的名词复数）

extermination camps───灭绝集中营

attrition rate───[军]损耗率；退学率

Looking for the presence of particular species also tends to focus on extinction rates.───寻找特定物种的存在渐渐趋于注重物种灭绝率。

Scientists compared extinction rates from the fossil record with the speed at which mammals are vanishing today.───科学家是通过比较哺乳动物远古和今日的灭绝速度来计算周期的。

Extinction rates may therefore also have been underestimated, meaning───灭绝的速率或许也被低估了，这意味着许多物种——远远多于我们原先认为的——在还没有被发现之前就已经灭绝了。

Scientists estimate current extinction rates are at least a hundred to a thousand times higher than natural rates.───科学家估计现在的灭绝率至少是鱼类自然灭绝的100到1000倍。

Looking for the presence of particular species also tends to focus on extinction rates.───人们由寻找特定物种的存在渐渐趋于注重物种灭绝率。

Unfortunately, extinction rates have accelerated to ten to a hundred times their natural level, Worm added.───不幸的是，物种灭绝率已经加速到他们自然水平的10倍到100倍了，沃姆（Worm）补充道。

Djoghlaf argued that extinction rates for some animal or plant species were at a historic high, up to 1, 000 times those seen before, even affecting crops and livestock.