no smoking.不许吸烟.
no photoes.不许拍照.
don't speak aloud.不许大声喧哗.
don't touch the valuables.禁止触摸贵重物品
handle with care.小心轻放.
wear a lab coat.请穿实验装.
what can you do and what can not you do in your school lab
2个回答
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