中心力是由球对称的势能函数而来的力.A central force is one derived from a potential - energy function that is spherically symmetric.有心力是一种径向力,它的大小只取于离原点的距离.A central force is a radial force which depends only on the distance from the orig...
"I don't understand it," he said, over and over again.“我不明白，”他反复不停地说。We had to do the scene over and over again, from different angles.我们不得不翻来覆去地从不同的角度拍这个场面。This is what she has been saying over and over again -- I ...
“我们一定可以做点儿什么吧？”佩林突然插话道。"Surely there's something we can do?" interjected Palin.克莱门茨不及回答他就插话了。He chipped in before Clements could answer.由于他不断的插话,我无法把想说的话都说出来.I could not say all I wished because of the interruptions...
Every year new strains of influenza develop.每年都有新的流感病毒出现。They took steps to prevent the spread of influenza.他们采取措施阻止流感的传播.The last attack of influenza has left me rather groggy.上次患流行性感冒后使我至今软弱无力....