肃立: stand as a mark of respect 短语和例子肃立致哀 stand silently mourning; 奏国歌时全场肃立。 all those present were standing solemnly when the national anthem was played
默哀: stand in silent tribute 短语和例子在死者遗像前默哀 3分钟 observe three minutes' silence in front of the portrait of the deceased; 全体起立默哀。 all rose and stood in silent tribute