1. Or chooses keel seriously, always have bug eye or bark, uniform need not. 要么认真挑选龙骨，凡是有虫眼或树皮的，一律不用。
2. A movable keel in a sailboat that can be pivoted upward to reduce the boat's draft in shallow water. 活动防浪板帆船上一活动龙骨，可以绕枢轴扯起以减少船在浅水的''。'吃水'。''''。'深度'。''。
3. The calf shank includes a downward convexly curved lower end which is secured to the foot keel by way of coupling element (73). 所述小腿胫包括向下突出的弯曲下端，该下端通过连接部件（73）固定在所述脚龙骨上。
英英解释
n.
1. the median ridge on the breastbone of birds that fly
2. one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into t v.
1. walk as if unable to control one's movements
