名词
中文翻译：次级弹丸
同义词：
['sub-projectile', 'sub-shot']
例句：
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1.The projectile was launched from a distance of 50 meters.
弹丸从50米的距离发射出去。
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2. The sub-projectile was designed to travel at high speeds and penetrate deep into the ocean.
这个次级弹丸被设计用来以高速穿透深海。
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3. The sub-projectile was used in the military to deliver explosives underwater.
这个次级弹丸被用于军事，用来水下投放爆炸物。