Bryoflora of the alpine tundra of Changbai Mountain and its floristic relationship to the bryofloras of arctic tundras.
长白山高山冻原苔藓植物区系及其与北极冻原苔藓植物区系的关系。
Rain forests, tundras, and everglades are not themselves natural closed systems; they are open to each other.
雨林、冻土带、沼泽本身并不是自然的封闭系统：它们相互之间是开放的。
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