目的研究腮腺区放射性粒子植入后的位置稳定性。
Objective To study the position stability of radioactive seed in parotid gland region after radioactive seed implantation.
控制理论长期以来将控制目的主要集中于系统平衡位置稳定性和设计控制器以保证对系统进行镇定上，已不能符合控制系统当今的实际要求。
The main objective of control theory has long focused on the stability analysis of system equilibrium and stabilizing controller synthesis. But these can not meet the practical need anymore.
他在此位置上不寻常的稳定性，部分是因为他潜在的接任者会发现他们将确实是位置不稳的，还有部分是因为他帮高盛赚了大笔的钱。
Once there, he enjoyed unusual stability, in part because his putative successors found that they were indeed replaceable, and in part because he helped Goldman make a huge amount of money.
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