拼音：yú ān sī wēi
注音：ㄩˊㄢㄙㄨㄟ
解释：于：处于；思：想。虽然处在平安的环境里，也想到有出现危险的可能。指随时有应付意外事件的思想准备。
出处：《战国策·楚策四》：“臣闻之《春秋》，于安思危，危则虑安。”
In: in; Si: Yes. Although we are in a safe environment, we also think of the possibility of danger. It refers to being mentally prepared to deal with accidents at any time.
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