Its oscillation depends on the strength of the gravitational field.它的振动幅度取决于引力场的强度。the gravitational pull of the moon月球的引力Dark matter gives out no light and is detectable only because of its gravitational effect on visib...
We are selling the full range of World Cup merchandising.我们出售世界杯的所有纪念商品。Robinson was sent to Italy to cover the 1990 World Cup.鲁宾逊被派到意大利报道1990年的世界杯比赛。In a warm-up game for the World Cup, Uruguay have beaten England.在世界杯热...