sen·ti·nel
noun/ˈsentɪnl/
/ˈsentɪnl/
(literary)- a soldier whose job is to guard something
哨兵 - (figurative) a tall round tower standing sentinel over the river
镇守在河边的一座高高的圆塔 - Large dark pines stood like sentinels guarding the wintry garden.
高大的黑松树像哨兵一样矗立着，守卫着寒冷的花园。
Word Originlate 16th cent.: from French sentinelle, from Italian sentinella, of unknown origin. - (figurative) a tall round tower standing sentinel over the river