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mortality

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definition: 
Death, especially on a large scale
sentence: 
The most dramatic and perhaps most significant cause of natural mortality among gray whales is predation by killer whales. Cervical cancer is the second leading cause of cancer mortality among women worldwide. Maternal deaths have been shown to account for a substantial burden of mortality among refugee women of reproductive age.
difficulty: 
medium
toefl frequency: 
2
toefl classification: