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它可能已经被抛过或隐蔽掉，为什么呢？
It could have been already tossed and concealed. Why would that be?
youdao
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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.
youdao
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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.
youdao