“未知汇”的研究是全球碳循环及全球气候变化研究的主要内容之一。
The research on "missing sink" is main content in the global carbon cycle and global climate change.
平面汇交力系的解析法是用平面汇交力系的平衡方程计算未知力，其平衡方程最简单，但也最容易出错。
The analytical method of system of plane intercrossing forces is to calculate unknown forces by use of equilibrium equation of plane system of plane intercrossing forces.
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