由于缺乏推动力，我们美国大众似乎对呆在地球范围内感到满意。
Absent a driving force, we the American public seem to be satisfied to stay in Earth orbit.
总的说来，人们对海洋上混合层的热力结构的认识已经颇为深入，但是对混合层内的许多动力过程，以及这些动力过程和热力过程的相互耦合尚缺乏深入的了解。
The thermal structure of the upper ocean has been well understood, however, some dynamic processes in the mixed layer, as well as the coupled thermodynamic processes, are not so clear.
总的说来，人们对海洋上混合层的热力结构的认识已经颇为深入，但是对混合层内的许多动力过程，以及这些动力过程和热力过程的相互耦合尚缺乏深入的了解。
The thermal structure of the upper ocean has been well understood, however, some dynamic processes in the mixed layer, as well as the coupled thermodynamic processes, are not so clear.
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