守卫;
We must stand sentinel to protect ourselves; The jewels over which they kept guard were stolen.
我们必须让哨兵站岗保护我们; 他们站岗保卫的宝石被盗.
You must stand guard over him at all times.
你必须一直守卫着他.
They are asked to stand guard over important documents.
他们被要求守卫那些重要文件.
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