Eurasian walnut valued for its large edible nut and its hard richly figured wood; widely cultivated.

欧亚一种胡桃，由于其大的可食用的坚果和硬的丰富的有纹理的木材而很有价值；广泛载植。

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And there are slower-growing trees like the black walnut that provide a nut crop as well as wood.

还可以种植生长速度比较慢的胡桃，可以生产坚果和木材。

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Usually there are 12 categories which are bolt , stud, screw, nut , self tapping screw, wood screw, gasket, retainer ring, pin, composite member, bolting, and soldering lamp.

它通常包括以下十二类零件：螺栓、螺柱、螺钉、螺母、自攻螺钉、木螺钉、垫圈、挡圈、销、组合件和连接副、焊钉等。

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