Microbiologists have been growing microbes on agar plates for nearly 150 years, but agar’s discovery dates back to a happy accident in a mid-17th-century kitchen. Legend has it that on a cold winter day, a Japanese innkeeper cooked tokoroten soup, a Chinese agar seaweed recipe known in Japan for centuries. After the meal, the innkeeper discarded the leftovers outside and noticed the next morning that the sun had turned the defrosting jelly into a porous mass. Intrigued, the innkeeper was said to have boiled the substance again, reconstituting the jelly. Since this discovery, agar has become a staple in many Japanese desserts, from yokan to anmitsu.
令仪发现孩子接触不良内容后，并未立即检查手表或质问，而是手写访谈提纲，通过理性沟通说明这类内容的危害，“我要让他知道，收到这样的信息不是他的错，但必须学会辨别，并且高度重视”。
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1. 找出最大数，确定最大位数d
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