vt.钻孔装埋，打埋头孔；n.埋头孔，暗钉眼； 变形： 过去式：countersank过去分词：countersunk现在分词：countersinking第三人称单数：countersinks 英英释义： countersink[ 'kauntə,siŋk ]n.a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surfacea bi