请说，所以我说当固定θ时,得到的是半平面，而非全平面,它布满z-轴的一侧,但从不延伸到z-轴的另一侧，为什么？
Yes? Yeah, so I'm saying when you fix theta you get only a half plane, not a full plane I mean, it goes all the way up and down, but it doesn't go back to the other side of the z axis. Why?
应用非线性系统的定性理论方法，对一类军事竞争系统进行了定性分析，研究了系统平衡点的性态，证明了系统在全平面不存在闭轨线。
The paper is devoted to nonlinear analysis of a military contest system. The nature of equilibrium points is studied. The nonexistence of closed orbit in real plain is proved.
但是来自长江水资源管委会的王建全承认，大坝已经使得两个县城的最大淡水湖水平面下降，使得情况更糟。
But one official, Wang Jingquan of the Yangzi's Water Resources Committee, conceded that the dam had lowered water levels in two of the country's biggest freshwater lakes, making the impact worse.
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