medical angiopteris rhizome
固定散射中心近似 [核] fixed scattering centre approximation
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如果没办法定心练画，那么散个步；写首诗；找个美丽乡间，开车游一程；或在城里漫个步。
If that is too difficult then go for a walk, write a poem, drive into some lovely countryside or stroll around the city.
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