How to write danger signs on windows without glass

There is no glass here to prevent falling.

When writing dangerous slogans, you should write clearly what you want to express. When posting them, they should be posted in a more conspicuous place. For example, be prepared for danger in times of peace, the alarm bell always sounds, strictness is the call of life, looseness is suicide. the beginning of.

Danger slogans can serve as warnings, prevent problems before they occur, increase people's vigilance, and prevent accidents.