偶然accidental;adventitious;by chance;contingent;incidental;occasional;random详细»
偶然contingency详细»
偶然accidental;chance;fortuitous;occasional详细»
偶然at haphazard;by accident;by chance;by haphazard;contingence;contingency详细»
偶然contingency详细»
偶然casual;it so happened that;knock against详细»