以防万一
- na.make provision [provide] against emergencies
- 网络in case; just in case; in case of

以防万一
1.make provision [provide] against emergencies; be prepared for any contingency [all contingencies]; be prepared for the worst; have a spare wheel ready all the time; have two strings to one's bow; (Take an umbrella with you) just in case; lest peradventure ...; prepare against one out of ten thousand; save [lay up] against a rainy day; take measures in advance against the time of need
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