常見例句雙語例句well there is this initial impedance from explosion, sure the cannon ball can keep going horizontally but as soon that impedance goes it store its natural motion which is downward.在發(fā)射的最初階段會(huì)產(chǎn)生一個(gè)阻力，使得炮彈可以保持水平飛行,很快阻力就消失了，自然力使得它向下運(yùn)動(dòng)。 返回 natural impedance