Third, high tariff and threatened by the challenge from the terrestrial system;
三是通话费用高，各地价格差别大，且受到地面系统的有力挑战；
Therefore, the research about carbon cycle of terrestrial eco-system is profound.
因而展开陆地生态系统内的碳循环研究意义重大。
Therefore, the research about carbon cycle of terrestrial eco-system is profound.
因而展开陆地生态系统内的碳循环研究意义重大。
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