(n.) The quality or state of being tough.

手打:蘭斯洛特

• This is greatly increased by twisting the fibers together, and is added to by the toughness of the fibers themselves, the whole giving to rope a great resisting power. 佚名. 神奇的知識之書.
• Only minds of extraordinary toughness and originality could resist such a torrent of suggestion. 赫伯特·喬治·威爾斯. 世界史綱.
• Use the chicken then, the toughness won't matter in a salad, advised his wife. 路易莎·梅·奧爾科特. 小婦人.

整理:蘇西