坚固 + 的 + Noun
The adjective 坚固 (jiāngù) means "firm," "sturdy," or "solid." It describes objects or structures that are strong and resistant to damage. It can also be used figuratively for things like relationships or defenses. For example, 坚固的城墙 means "a sturdy city wall."
这座桥非常坚固,用了上百年都没坏。
zhè zuò qiáo fēicháng jiāngù, yòng le shàng bǎi nián dōu méi huài.
This bridge is very sturdy; it has lasted over a hundred years without breaking.
他们之间的友谊像石头一样坚固。
tāmen zhījiān de yǒuyì xiàng shítou yīyàng jiāngù.
Their friendship is as solid as a rock.
这个箱子很坚固,不容易摔坏。
zhège xiāngzi hěn jiāngù, bù róngyì shuāi huài.
This box is very sturdy and not easy to break.