牢固性的英文：
fastness ;firmness

fastness是什么意思：
n. 要塞,巩固,迅速
  • This is a fast delivery.
    这是一个快投球。
  • You cannot react fast enough to just be a fast follower.
    只做一个快速跟进者不能保证反应得足够快。
  • He runs as fast as Paul.
    他跑得和保罗一样快。
  • Run as fast as you can.
    你能跑多快就跑多快。
  • Why, I was fast asleep.
    怎么，我睡得很熟的呀。
firmness是什么意思：
n. 坚固；坚度；坚定
  • Are the firm's finances sound?
    这家公司的财务状况可靠吗?
  • His step was not as sharp and firm.
    他的脚步不再像从前那样敏捷、坚实。
  • To become firm or gelatinous; congeal.
    凝固凝结或变硬；冻结
  • To make or become firm.
    使稳定，使变坚固
  • make firm or secure; strengthen.
    使坚固或安全；强化。

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