婴儿死亡率在许多发展中国家是一个关键问题。

Infant ___mortality is a critical issue in many developing countries.

由于疫苗接种计划，该疾病的死亡率已显著下降。

The ___mortality rate from the disease has significantly decreased due to vaccination programs.

这些地区的高死亡率通常与医疗资源有限有关。

High ___mortality in these regions is often associated with limited access to healthcare.