Chinese phrase
请勿使用〜 qǐng wù shǐ yòng 〜
Meaning
Please do not use ___
When to use it
A polite way to say that something must not be used. It is common on signs and notices, with the item named after it.
Example dialogue
门口的牌子上写着：请勿使用闪光灯。 mén kǒu de pái zi shàng xiě zhe qǐng wù shǐ yòng shǎn guāng dēng
The sign at the entrance says, "Please do not use the flash."
好的，我不会用闪光灯了。 hǎo de wǒ bú huì yòng shǎn guāng dēng le
Okay, I won't use the flash.