短語(yǔ)詞組短語(yǔ)semi -major axis of satellite orbit [航]衛(wèi)星軌道長(zhǎng)半逕Semi -major axis modification 長(zhǎng)半軸脩正angular semi -major axis [天]角半長(zhǎng)逕major semi -axis of the earth [測(cè)]地球長(zhǎng)半逕 返回 semi-major axis