使坚固to strengthen

• 固防

  consolidate defences

牢固firm

• 基础已固

  have a firm foundation

• 加固

  reinforce

坚硬solid

• 凝固

  solidify

鄙陋<书>shallow

痼chronic

坚决地firmly

• 固请

  insistently request

本来in the first place

• 固当如此

  just as it should be

• 固所愿也

  exactly what I want

参见：固然[gùrán]

• 我固知不易实行，但仍想一试。

  Of course I realize it is not easy to do, but I still want to try.