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...
“我10点半去接你，”她果断地说道。"I'll call for you at half ten," she said decisively.他起身去接了电话。He got up and answered the telephone.让我们留个口信,通知她到火车站去接我们.Let's leave her a message to meet us at the railway station....