镇守

zhèn shǒu dū shì

镇守都市

defend the city

zhèn shǒu jiāng tǔ

镇守疆土

guard the territory

zhèn shǒu biān jìng

镇守边境

guard the border

zhèn shǒu zài hé biān de yī zuò gāo tǎ

镇守在河边的一座高塔

a tall tower standing sentinel over the river