As I watched, a gull flew by, above the spruces.在我观望的时候, 一只海鸥飞过云杉.Firs, spruces and pines are conifers.冷杉 、 云杉和松树都是针叶树.Seen from a distance, yeddo spruces grew all around the middle of the mountainside.从远处看去, 半山腰上长满了鱼鳞松....
The fractograph exhibited typical ductile dimple fracture pattern.断裂形式呈韧性断裂,断口以韧窝为主.The toughness, fractograph and microstructure of the failed die specimens have been examined and analysed.检测了失效模具材料的微观组织 、 击韧性和断口形貌.The ...