柯林斯詞典nutation /nju??te???n/ 1. N a periodic variation in the precession of the earth's axis causing the earth's poles to oscillate about their mean position (造成地球磁極在其平均位置的周圍擺動(dòng)的)地球軸線運(yùn)動(dòng)的周期性變化[astronomy] 返回 nutation