历史有自己的轨迹，但大多数危机都需要人们去权衡一个个的未知，并在互相竞争的魔头中进行选择。
History has its upward arcs, but most crises require weighing unknowns against unknowns, and choosing between competing evils.
你仍然需要为未知区域保持您的旅行轨迹可以掩盖发现地区。
You will still need to keep track of your travels as undiscovered areas can obscure discovered areas.
在被探索并理解了其真正目的后自我破坏中的痛苦就揭露了能够改变生活轨迹的新的未知疆域。
When explored and understood for its true purpose, the pain of our own self-sabotage reveals new and uncharted territories that can change the course of our lives.
在此基础上，给出了系统参数未知时由空间机械臂末端惯性空间期望轨迹产生机械臂关节铰期望角速度、角加速度的增广自适应控制算法。
When the inertial parameters are unknown, two adaptive control schemes are proposed based on the results for a free- floating space manipulator system to track the desired trajectory in workspace.
以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组，但直接求解过于复杂，采取迭代的方法解决。
Non-linear equations are(constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.
以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组，但直接求解过于复杂，采取迭代的方法解决。
Non-linear equations are(constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.
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