因此，在进行飞行器动力学的专门研究之前，有必要对该问题的空气动力学方面作一定深度的探讨。
It is essential therefore to explore the aerodynamic aspect of the subject in some depth before proceeding to particular studies of vehicle dynamics.
船舶是一种特殊的物，有必要对其物权的法律适用问题作专门研究。
Ship is a special thing, it's necessary to research its law application separately.
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