牢固性的英文：
fastness ;firmness

fastness是什么意思：
n. 要塞,鞏固,迅速
  • This is a fast delivery.
    這是一個快投球。
  • You cannot react fast enough to just be a fast follower.
    只做一個快速跟進者不能保證反應(yīng)得足夠快。
  • He runs as fast as Paul.
    他跑得和保羅一樣快。
  • 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. 堅固；堅度；堅定
  • Are the firm's finances sound?
    這家公司的財務(wù)狀況可靠嗎?
  • His step was not as sharp and firm.
    他的腳步不再像從前那樣敏捷、堅實。
  • To become firm or gelatinous; congeal.
    凝固凝結(jié)或變硬；凍結(jié)
  • To make or become firm.
    使穩(wěn)定，使變堅固
  • make firm or secure; strengthen.
    使堅固或安全；強化。

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