叶兴庆说，尽管国内生产仍是中国最重要的政策，进口已经成为一个日益重要的成分。
Though domestic production is still its most important policy, imports have become an increasingly crucial component, Mr. Ye said.
为了便于计算，对兴波部分简化了计算模型，螺旋桨用无限叶数螺旋桨模型来代替。
A simplified model of propeller with infinite number of blades is employed to account for the effect of free wave in this paper.
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