" I find it hard to comment on "demonstration procedures and signs" without more information about exactly what the situation is and what they are studying.
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prarngYesterday, I ended up with "Your safety is our primary concern. Please take a few minutes to watch the following demonstration and pay attention to safety instructions and signs.".That is basically OK. I have a couple of quite picky comments. "Please take a few minutes to ..." tends to suggest that the audience is in control of how long they spend doing