former / original / primary / raw / level / cause / source
原
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Mnemonic symbol: I like how 原子, literally "original seed", means "atom". I'll represent 原 by 原子弹, an atomic bomb.
原
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厂
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自
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小
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In the anthill's kitchen Yu the Great is modding a chocolate factory into a nuclear chocolate factory by powering it with an atomic bomb. Because it is hard to look inside the bomb through it's small opening, she uses a hand mirror to see inside and connect the wires. She also used a lot of daisies to decorate the bomb and underline her peaceful intentions.