quadrillion
/kwɔˈdrɪlɪən; kwɑd`rɪljən/ pron, det, n(pl unchanged or ~s 复数或不变或作 quadrillions) (after a or one, a number, or an indication of quantity 用於a或one之後或用於数目或表示数量的词语之後)
1 (Brit) number shown by 1 followed by 24 zeros; one million to the power of 4 *1後有24个0的数; 一百万的4次幂.
2 (US) number shown by 1 followed by 15 zeros; one thousand to the power of 5 *1後有15个0的数; 一千的5次幂.