Accidents have characteristics of contingency, inevitability and preventability. Fully realization of these characteristics is of great significance in raising the level of safety awareness.
事故的发生具有偶然性、必然性和可预防性等特性，充分认识事故的这些特性对提高安全意识水平有重要的意义。
This paper defines the concept of family violence, and analyzes its popularity, hazard, potency, hidden-ness, repetition, precipitation and preventability.
本文对家庭暴力的概念及家庭暴力具有的普遍性、危害性、隐蔽性、反复性、突发性、可预防性特点进行了一定的分析。
Objective:To assess existence and preventability of adverse drug events(ADEs) and to investigate excess length of stay and extra hospital charges of the ADEs.
目的：调查住院病人药物不良事件（ADE）发生率、因ADE而造成的医疗费用、延长的住院时间及ADE的可防范率。
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