习惯用语turn turtle1.底部朝天地翻转过来; 沉没2.变得无能为力3.[美俚]退缩, 畏缩特殊用法big-headed turtle1.大头龟green turtle1.海龟hawkbill turtle1.玳瑁long-necked turtle1.长颈恐龟map turtle [terrapin]1.黄斑图龟marine [sea] turtle1.海龟, 海鳖Queen turtle1.光滑鳖soft-shelled turtle1.鼋stewed turtle1.炖甲鱼