IRV

例句：

1. 1. The IRV is a type of volcanic rock that contains high levels of iron.
   IRV是一种含有高浓度铁的火山岩。
2. 2. The IRV is used in construction to provide strength and durability.
   IRV用于建筑中以提供强度和耐久性。
3. 3. The IRV has been found to have unique properties that make it useful for various applications.
   研究发现，IRV具有独特的性质，使其在各种应用中非常有用。