noun🔗Share要塞，堡垒。 A secure or fortified place; a stronghold, a fortress."The castle served as the king's fastness during the long siege. "在漫长的围攻期间，这座城堡是国王的要塞，保护着他的安全。militaryarchitecturebuildingChat with AIVocabulary GamePractice Reading
noun🔗Share快速，速度。 The state of being fast."The fastness of the internet connection is crucial for online learning. "网络连接的速度对于在线学习至关重要。qualitybeingChat with AIVocabulary GamePractice Reading
noun🔗Share耐晒度，坚牢度 The ability of a dye to withstand fading."The fabric's fastness ensured the colorful school banners would stay vibrant for years. "这种布料的耐晒度很好，确保了色彩鲜艳的学校横幅多年都不会褪色。colormaterialtechnicalindustryqualityChat with AIVocabulary GamePractice Reading
