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.神奇的知识之书.
Only minds of extraordinary toughness and originality could resist such a torrent of suggestion. 赫伯特·乔治·威尔斯.世界史纲.
Use the chicken then, the toughness won't matter in a salad, advised his wife. 路易莎·梅·奥尔科特.小妇人.