Black walnut kernels are difficult to get out of the shell.
黑核桃的果仁很难从壳中取出。
Black walnut shells are so hard they require special crackers.
黑核桃的壳相当硬，因此必须使用特殊的碎裂机。
Black walnut is extremely sensitive to damage from late spring frosts.
黑胡桃对春天晚霜的危害非常敏感。
Black walnut is extremely sensitive to damage from late spring frosts.
黑胡桃对春天晚霜的危害非常敏感。
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