Careful examination , however , reveals that the extinction of any one species disrupts the food chain , and the loss of a plant species leads to the disappearance of a key ingredient which might yield a cure for cancer.

• 然而，仔细的考察揭示出任何一个物种的灭绝会破坏食物链，一种植物的消失造成有可能生成治疗癌症的药物的关键成分的缺失。