sentinel造句

a tall round tower standing sentinel over the river
镇守在河边的一座高高的圆塔

sentinel duty
哨兵义务

We gave the watchword, and the sentinel let us pass.
我们说出口令, 哨兵就把我们放过去了.

The lone sentinel walked toward his post.
忧愁的哨兵走向岗哨.

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