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Useful Memory Trick:
公式 ("gong1 shi4"- formula; any established or conventional method; expressions...):
In order for any <formula> in math or physics to be valid, it must be published in a public(公) style(式) subject to peer review.
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User: bertus
Age: 57, Male
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China
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Guangdong
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Guangzhou
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Native Language: Dutch
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