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Kúi-tō tn̂g pòaⁿ-kèng
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Kúi-tō tn̂g pòaⁿ-kèng (軌道長半徑; semi-major axis), he̍k-chiá kiò pòaⁿ-tn̂g-te̍k (半長軸), sī kí-hô-ha̍k lāi ê iōng-gí, the̍h-lâi biâu-su̍t thó-îⁿ kap siang-khiok-sòaⁿ.
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Kúi-tō tn̂g pòaⁿ-kèng (軌道長半徑; semi-major axis), he̍k-chiá kiò pòaⁿ-tn̂g-te̍k (半長軸), sī kí-hô-ha̍k lāi ê iōng-gí, the̍h-lâi biâu-su̍t thó-îⁿ kap siang-khiok-sòaⁿ.