常見例句雙語例句It is well known that the earth tide causes the temporal variations of gravitational field.精密和詳細(xì)測定地球重力場及其時間變化，是目前衛(wèi)星重力測量的主要課題。權(quán)威例句Tide: periodic rising and falling of large bodies of water resulting from the gravitational attraction of the moon and sun acting on the rotating earth.UNESCO: L O S S A R Y 返回 gravitational tide