| 例句 |
sentinelnoun a person or group that watches over someone or somethinga lone sentinel kept watch over the fort custodian, guard, guardian, keeper, lookout, minder, picket, sentry, warden, warder, watch, watcher, watchman observer, patrol, spotter, surveillant, watchdogbodyguard, convoy, defender, escort, honor guardgatekeeperhack(slang) in 1579 |