她穿的那件轻薄的粉红色连衣裙在身后飘舞。She was wearing a flimsy pink dress that streamed out behind her.他把其他的摩托车手甩在身后。He left a host of other riders trailing in his slipstream.他双手紧扣，背在身后，在走廊里踱来踱去。He paced the corridor, hands clasped behind...
joyful的反义词有：sorrowful, sad, grievous, grievous, sorrowful, sad。adj.joyful的反义词（欢喜的）：sorrowful, sad, grievous。joyful的反义词（其他释义）：grievous, sorrowful, sad。...
Aggregates are compact and close to spherical in shape.聚集体结构紧密并且形状接近于球形.We carry out a transformation to spherical polar coordinates.我们变换成球极坐标.Both spherical and regular crystalline forms are relatively rare.球形的和规则的球晶形成相...