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...
"Giles phoned this morning," Mirella said with feigned indifference.“贾尔斯今早来电话了，”米雷拉装作若无其事地说。Sally spun round, a feigned look of surprise on her face.萨莉急转过身来，脸上装出一副吃惊的表情。He feigned indifference to criticism of his work.他假...