通过第三年的训练，大多数住院医生机械的掌握了解了心理动力学心理疗法理论，但是很多没有临床的实践经历。
And by the third year of training, most residents have had didactic teaching about psychodynamic psychotherapy, but many have not had experiential clinical exposure to it.
通过追踪该比率随时间的变化，他可以确定氡气到达地表需要花费多长时间，同时获得气体所通过的岩石的化学、热力学和机械状态。
By tracking this ratio over time, he can determine how long gas has taken to reach the surface and gain clues to the chemical, thermal, and mechanical state of the rocks the gas is passing through.
本文研究石油机械企业多产品生产的规划决策问题，运用系统动力学的原理建立了相应的系统模型。
This paper researches the planning and decision making problem of petroleum mechanical multiproduct enterprises, and establishes the corresponding system model by using systematic dynamic principle.
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