坚固

zhè shì yī zuò jiān gù de jiàn zhù

这是一座坚固的建筑。

This is a solid building.

zhè zuò qiáo jiàn zào de hěn jiān gù

这座桥建造得很坚固。

This bridge is very solidly built.

tā jiǎo xia de dì jiān gù ér jiē shi

她脚下的地坚固而结实。

The floor felt strong and solid beneath her feet.

jiān gù de zhèn dì

坚固的阵地

strong position

jiān gù qiě nài yòng

坚固且耐用

sturdy and durable