RII：第二区

“第二区”（英文：Region II）在多种综合性场景及演讲活动中被广泛使用。为便于快速书写与高效沟通，通常将其缩写为“RII”。这一简称在内部文档、活动议程及会议材料中频繁出现，有助于简化表达并提升信息传递的效率。

Region II(RII) b, Province Hainan;
区域Ⅱb，海南省；
Among these six regions, SO_2 and PM10 pollution are most serious in Region II(RII) and the annual concentration of which is beyond level III of the national standard.
其中山西、河南北部和河北西南部地区是全国SO2和PM10污染最严重的区域，其区域SO2和PM10年均浓度都超过国家三级浓度限值；
The salinity gradient reached 0.4 ~ 0.6/km on the sea surface between the region I ( S2 and M2 ) and the region II ( SI and Ml ).
另外从Ⅰ区的S2、M2到Ⅱ区S1、M1之间的表层盐度梯度达0.4／km～0.6／km。
In region I, the crack growth rate increased with increasing crack tip strain rate. In region II, the crack propagation rate was independence of the crack tip strain rate.
裂纹扩展速率在区域I随裂尖应变速率增加而增大，而在区域II不随裂尖应变速率的改变而变化。
The creep deformation in region I was dislocation-controlled whereas the abnormally high stress exponent in region II was associated with the effects of recrystallization resulting in a reduction in the overall grain size of the initial structure.
蠕变变形的第一区域是位错控制的蠕变机制，而在高应力区第二区(RII)域，是由于整体晶粒尺寸减小造成的再结晶控制的蠕变机制。

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