Premature birth is the main cause of perinatal mortality.

早产是围产期死亡的主要原因。

《柯林斯英汉双解大词典》

The grass grows up to four metres tall and burns fiercely, creating super hot fires that cause catastrophic tree mortality.

草长到四米高，剧烈燃烧，所造成的特大火灾导致树木灾难性的死亡。

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Cardiovascular disease is the biggest cause of mortality in the world, the study said.

研究表明，心血管疾病是死亡率最高的疾病之一。

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"It does not really matter because in the best case scenario we have today,we will still have a moderate virus that is projected to cause several million deaths extra deaths than the usual influenza annual mortality, which means that even in the best-case scenario, we do have an emergency on our hand,"

VOA: standard.2009.09.04

Finally, and most important, recent studies have shown convincing evidence that cardio-respiratory fitness is a much stronger predictor of longevity and reduced risk of cardiovascular mortality and all-cause mortality than BMI.

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"Collisions with ships are the number one cause of mortality, and entanglement in fishing gear is the number two cause, " Lecky said.

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Vitamin D has been convincingly correlated with all-cause mortality, with certain cancers, and with multiple sclerosis.

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