n. 1.坚固，坚牢；固定，固着。 2.【纺织；印染】坚牢度；不褪色性；抗(毒)性。 3.迅速，急速。 4.放荡。 5.要塞，堡垒。 短语和例子 acid fastness 耐酸性。 fastness to light 耐光性，不褪色。 fastness to washing 耐洗度。
a strongly fortified defensive structure 同义词：stronghold,
the quality of being fixed in place as by some firm attachment 同义词：fixedness, fixity, fixture, secureness,
a rate (usually rapid) at which something happens; "the project advanced with gratifying speed" 同义词：speed, swiftness,
例句与用法
1.
Thermosetting resins impart durable press or wash-and-wear properties to the fabric and improve the fastness of the repellent . 热定型树脂给织物添加永久性定型或洗穿性能，并改进防护剂的牢固性。
2.
Marauders, or men that had been driven to that desperate mode of life, quartered themselves in the fastnesses nearest to the low lands . 强盗们，实际上是逼上梁山的亡命之徒，啸聚在邻近低地的城寨里。
3.
Zip fasteners . tests for fastness of dyes to washing 拉锁.耐洗涤染色牢度的试验
4.
Testing method for colour fastness to alkali spotting 耐碱斑污色牢度的试验方法
5.
Textiles - tests of colour fastness - colour fastness to spotting : water 耐水斑色牢度
6.
Testing method for colour fastness to stoving 耐亚硫酸气体漂白色牢度的试验方法
7.
General principles of testing methods for colour fastness 染色牢度试验方法通则
8.
Test method for colour fastness to organic solvents 耐有机溶剂色牢度的试验方法
9.
Test methods for colour fastness to chlorinated water 耐氯化水色牢度的试验方法
10.
Test methods for colour fastness to xenon arc lamp light 氙弧灯光色牢度的试验方法
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