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。
2
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。
3
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.