牢固的英文：
firm
secure

参考例句：
  • We should have a firm grasp of the fundamentals of mechanics.
    我们应牢固掌握力学的基础知识。
  • Sewing threads are made by twisting single yarns together to form a stronger thread.
    缝纫线是由几股纱线合在一起纺成一股更加牢固的线。
  • Solid knowledge of wireless communication technologies such as GSM, TDMA, CDMA and 3G systems such as WCDMA and UMTS
    对无线通讯技术如GSM，TDMA，CDMA和3G系统如WCDMA，UMTS知识功底牢固
  • Wisconsin's independent, maverick, polyglot nature was firmly established by 1848, the year it became a state
    威斯康星的独立不羁、自行其是、多族裔的特性是于1848年它成为一个州时就牢固形成的。
  • v. to secure or fix something firmly
    使某物牢固
  • Strong packing.
    包装牢固。
  • The architecture of this house is very substantial.
    这座房子的结构很牢固。
  • The struts are firmly braced.
    那些支柱上得很牢固。
  • There are a tough pair of walking boots .
    那有一双牢固的步行靴。
  • The bureau of cherry was also high and wide and solidly built.
    那个樱桃木柜也做得又高又大，十分牢固。
firm是什么意思：
n. 商号；企业
adj. 坚定的；坚固的；强有力的；确定的；坚挺的；严格的
v. （使）坚固；变坚实；加强；使坚定；回升
adv. 坚定地
  • 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。
secure是什么意思：
adj. 安全的；安心的；有把握的；牢固的
v. 使安全；保证；获得安全
  • a security guard
    安全警卫
  • This is a secure anchorage.
    这是个安全泊地。
  • Underwrite securities
    包销证券
  • The property was pledged as security for loans.
    这地产被当作贷款的抵押。
  • Mortgage Backed Securities
    以房地产抵押作担保的证券

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