名词
中文翻译：哨兵
同义词：
['guard', 'sentinel例句：1. The sentry stood watch over the gate all night.（哨兵整晚站岗在大门旁。）']
例句：
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1. The sentry stood watch over the gate all night.
哨兵整晚站岗在大门旁。
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2.He was a good sentry, always keeping an eye on his surroundings.
他是个好哨兵，总是警惕地观察周围环境。
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3.The sentry had to be vigilant at all times to prevent any intruders.
哨兵必须时刻保持警惕，以防止任何入侵者。