On a blackboard, he drew five concentric circles.他在黑板上画了5个同心圆。The curvature of the film is concentric with the mirror behind the meniscus.胶片的曲率是和弯月透镜后面的反射镜同心的.The street plan of the city has evolved as a series of concen...
remonstrate against cruelty to a dog抗议对一条狗的虐待We have sworn to fight cruelty wherever we find it...我们发誓要见恶除恶。Cruelty is a normal attribute of human behaviour...残忍是人的天性之一。Cruelty is a normal attribute of human behaviour.残忍...