n.哨兵,步兵( sentry的名词复数 );
例句:
The sentries alternate their watch.
哨兵们轮流看守.
We posted sentries ( at the gates ).
我们 ( 在大门口 ) 设了岗哨.
They've got sentries posted, and they were all armed.
他们布置了岗哨, 而且都武装了起来.