保安
bǎo ān
to ensure public security, to ensure safety (for workers engaged in production), public security, security guard
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她要求他们保持安静
tā yāo qiú tā men bǎo chí ān jìng
She asked them to be quiet
请保持安静，我正在学习。
qǐng bǎo chí ān jìng， wǒ zhèng zài xué xí。
Please be quiet, I am studying.
珠宝很安全
zhū bǎo hěn ān quán
Jewelry is safe
祝大家晚安
zhù dà jiā wǎn ān
Good night everyone
保持微笑。
bǎo chí wēi xiào。
Keep smiling.
请保持冷静。
qǐng bǎo chí lěng jìng。
Please keep calm.
请保持干燥。
qǐng bǎo chí gān zào。
Please keep dry.
请保持耐心。
qǐng bǎo chí nài xīn。
Please be patient.
各位同学，请安静。
gè wèi tóng xué， qǐng ān jìng。
Dear students, please be quiet.