The truing and sharpening methods of CBN wheels are summarized.综合评述了CBN砂轮的整形和修锐方法,分析了各种方法的特点和应用.The contradictions are sharpening.矛盾正在加剧.Band saw blunt files are for sharpening band saw blades having rounded gullets.主要是为...
a grove of birch trees白桦树丛We found that birch bark could serve as paper.我们发现桦树皮可以作纸用.They've got a wonderful birch in the back garden.他们在后花园有一棵极好的桦树....
Most of the butterflies perish in the first frosts of autumn.大多数蝴蝶会在秋天的第一场霜冻来临时纷纷死去。We don't have a computer (perish the thought) and have only recently bought an electric typewriter.我们没有电脑（死了心吧），只好最近买了台电动打字机。Crowns...