名词
中文翻译：守卫
同义词：
['protector', 'defender', 'watchman']
例句：
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1. The soldiers stood guard outside the castle gates.
士兵们站在城堡大门外面站岗。
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2. The guards were vigilant and kept an eye on everyone entering the palace.
守卫们警惕地监视着进入宫殿的每一个人。
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3. The guard was ordered to stand by the door until further notice.
守卫被命令站在门边直到另行通知。