insidious
adjective uk/ɪnˈsɪd.i.əs/ us/ɪnˈsɪd.i.əs/
暗中为害的;隐伏的
(of something unpleasant or dangerous) gradually and secretly causing harm
High blood pressure is an insidious condition which has few symptoms. 高血压是一种鲜现症状的潜伏性疾病。
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