North Korea has conducted its most successful submarine-launched ballistic missile test to date, in a display of its rapid advances in weapons technology amid heightened tension on the Korean peninsula.
北韓進行了迄今最成功的潛射彈道飛彈(SLBM)試驗，在北韓半島緊張局勢加劇之際展示其在武器技術上取得快速進展。
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