To protect, guard, or shield.

保护，保卫，阻挡。

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It is hard to protect shopping malls or guard water supplies everywhere.

ECONOMIST: Tense times at home

But with every legislator determined to protect bases and guard units in his or her home district, it looks harder and harder to see how money can be freed for this shopping spree.

ECONOMIST: Anything useful to do, besides fighting the army?

Your dentist may recommend a mouth guard or appliance (a splint for the teeth) to protect the teeth and possibly prevent grinding.

CNN: What can I do about teeth grinding?