短语词组短语elbow w bend 肘管elbow bend pipe 肘形弯管;弯头;弯管standard elbow bend 标准肘形弯管elbow bend knee 肘管encased elbow bend 有外壳的肘形弯管flange and elbow bend pipe 法兰盘弯管ge and elbow bend pipe 法兰盘弯管bend elbow 盘肘bend elbow handstand 屈肘倒立 返回 elbow bend