The adjective 高大 (gāodà) describes something that is both tall and imposing in size. It combines 高 (tall) with 大 (big) to emphasize physical stature or grandeur. It can describe people, buildings, trees, or structures like 高大的桅杆 (a tall mast).
那棵高大的橡树已经有一百多年的历史了。
Nà kē gāodà de xiàngshù yǐjīng yǒu yìbǎi duō nián de lìshǐ le.
That tall oak tree is over a hundred years old.
他身材高大,在人群中特别显眼。
Tā shēncái gāodà, zài rénqún zhōng tèbié xiǎnyǎn.
He is tall and stands out in a crowd.
城市里高大的建筑越来越多了。
Chéngshì lǐ gāodà de jiànzhù yuè lái yuè duō le.
There are more and more tall buildings in the city.