Included in the category are ebony, various mahoganies (see mahogany family), maple, teak, and American Black walnut.

硬材有许多种，如乌木、各种桃花心木、枫树、柚木和美国黑胡桃木。

youdao

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。

youdao

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。

youdao

It's most common in hard maple, but also occurs in birch, ash and, in rare cases, black walnut.

NPR: Excerpt: 'A Splintered History Of Wood'

To give the formal areas of the house a stately feel, he installed black double doors, stained black walnut flooring, and blue velvet curtains.

WSJ: How Maurizio Pellizzoni Is Bringing Warmth to London

Welsh Abergavenny for its recently Michelin-starred Walnut Tree and Black Mountains lamb, and Manchester-neighbour Ramsbottom for its wild garlic and South Indian cuisine.

BBC: Birmingham takes the culinary crown