指南針用于確定地理方向的設(shè)備，通常包括一個(gè)或多個(gè)水平安裝或懸掛的磁針，可在樞軸上自由活動(dòng)直到與地球磁場(chǎng)在一條線上 A device used to determine geographic direction, usually consisting of a magnetic needle or needles horizontally mounted or suspended and free to pivot until aligned with the magnetic field of Earth.
活動(dòng)防浪板帆船上一活動(dòng)龍骨，可以繞樞軸扯起以減少船在淺水的吃水深度 A movable keel in a sailboat that can be pivoted upward to reduce the boat's draft in shallow water.
中心銷連接馬車或其它車輛的車身和它的前軸的垂直栓銷，一般起樞軸作用 A vertical bolt that joins the body of a wagon or other vehicle to its front axle and usually acts as a pivot.
