事前in advance; beforehand; prior
～策划的暗杀a premeditated murder/～磋商prior (or preliminary) consultations/～防范take precautions/～警告forewarn/～联系get in touch in advance/～请示ask for instructions beforehand /～通知notify in advance;give prior (or advance)notice/～酝酿prior deliberation; exchange of views in advance |