nutational elli enutational ellipse章动: nutation; nodding椭圆: oval; oval-shaped; ellipse; ...天平动椭圆: libration ellipse振动椭圆: ellipse of vibration章动: [天文学] nutation; nodding 黄经章动 nutation in longitude; 倾角章动 nutation in obliquity; 章动传动 nutation drive; 章动轮 nutation wheel; 章动器 nutator; 章动轴 nutation shaft; 章动子 nutator 下载手机词典可随时随地查词查翻译