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Ageing in this case must occur according to the laws of physical chemistry and of thermodynamics.
It's as if hand-washing in any form "wipes the slate clean" and removes the residual feelings and rationalizations associated with the choice, Lee said.

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Open the tool →理化 (lǐ huà) means “Physics and chemistry”.
理化 is pronounced lǐ huà in Mandarin Chinese.
“Physics and chemistry.” is 理化 (lǐ huà) in Chinese.
This page has 2 example sentences using 理化, each with pinyin and an English translation.