从一个隐蔽的位置向目标射击。

All her shots hit the target.

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这种装置不应该安装在 墙 内或隐蔽的位置。

The device should not be installed inside a wall or in a concealed location.

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对于室内安装，重要的是要使得阀门易于进行测试和维修。不要安装在一个隐蔽的位置。

For indoor installations, it is important that the valve be easily accessible to facilitate testing and servicing. Do not install in a concealed location.

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