Definition: because of a possibility of something happening, being needed, etc. Level: B1
我认为我不需要钱，但我会带一些以防万一。
I don't think I'll need any money but I'll bring some ___just ___in ___case.
带张地图以防你迷路。
Bring a map ___in ___case you get lost.
我带着手机以防万一。
I have my mobile with me ___just ___in ___case.
