环可供这种环移动的绳子 、 竿子或圆材.The rope, rod, or spar on which such a ring moves.滑环在一根绳 、 杆子或圆材上可以自由来回移动的金属环.A metal ring that moves freely back and forth on a rope, rod, or spar.桅杆: 一种垂直圆材或杆,用来悬挂船帆.Mast: A vertical spar or pole to...
Metastatic tumors to gingival from non - oral malignancies are very uncommon.摘要从 非 口腔部位的恶性肿瘤转移至齿龈是非常罕见.Objective To study the distribution of the chromatic value of gingival porcelains.目的了解临床常用牙龈瓷的颜色参数.Gingival margins c...