suddennessn.意外;突然
suddenadj.突然的;出乎意料的n.突发之事
Sudden pity teared his sight.一股油然而生的怜悯之情使他眼泪汪汪。
sudden unexpected natural death猝死
Sudden Death Syndrome in cattle牛猝死症
sudden onset of precordial pain卒心痛
sudden death syndrome of soybean大豆猝死综合症
sudden neurosensory hearing loss猝发性神经感觉性听力障碍
sudden public healty emergencies突发公共卫生事件
sudden unexpained death syndrome不明原因瘁死综合症