The critical breakthroughs have been taking place in the structural designs, internal and external ballistics, and mathematical models, and it is now in dynamic firing test phase.
结构设计、内外弹道、数学模拟都取得了重大突破，已达动态发射试验阶段。
Moreover, the difference of the internal precipitation method and the external adding method for the second phase particles in steel was generalized.
同时，对钢中第二相粒子的内部析出法和外部加入法的差异做了简单的概述。
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