7月或8月时从它上边剪一些插枝。Take cuttings from it in July or August.他把书从上边的架子上取下来.He lifted the books down from the top shelf.把这本书放在其他书的上边.Put this book on top of the others....
他爱说笑话，喜欢谈论啤酒和姑娘。He cracked jokes and talked about beer and girls.李森科说笑话的时候自己咯咯直乐。Lysenko gave a deep rumbling laugh at his own joke.他们唱歌或说笑话使这个令人疲惫的旅程不至于单调乏味.They broke the monotony of the weary journey with songs and jo...
平衡方程和运动学关系式是与材料类无关的.The equations of equilibrium and kinematic relations are independent of the type of material.机械系统的运动学与动力学包括刚体的平面移动.Kinematics and dynamics of mechanical systems including rigid bodies in plane motion....