对了,关于ice cap的概念我碰到两次了,刚才上网查还是不大懂!!!
Ice caps are constrained to under 50,000 square Kilometers. Ice cap domes can be uncontrolled by topography, however they can be thin enough at their marins to be constrained by local topography.
还有the course of我遇到N次了,什么意思呀?