短語詞組短語semi -major axis of satellite orbit [航]衛(wèi)星軌道長(zhǎng)半徑Semi -major axis modification 長(zhǎng)半軸修正angular semi -major axis [天]角半長(zhǎng)徑major semi -axis of the earth [測(cè)]地球長(zhǎng)半徑 返回 semi-major axis