Correct

强固

/ jiàng gù / 
Strokes

Example

As an Adjective

strong and solid

1
Dǎxià
打下
jiànggù
强固
de
的
jīchǔ
基础

lay a solid foundation (for)

2
Jiànggù
强固
de
的
gōngshì
工事

strong fortifications