Researchers transplanted vegetation from four grassland ecosystems to lower , warmer elevations .
研究人员将四个草场生态系统的植被移植到海拔较低、较温暖的地域。
People who interact with their own pets have even higher elevations .
那些与宠物互动的人获得更高的提升。
However , that may be because none of those that is left is remotely big enough , and on those that were already occupied , building has continued , in some cases as if the claimants hope to turn rocks , or even " low-tide elevations " , into real islands-a practice not recognised under unclos .
