单词：billionths
(billionth 的复数) num. 第十亿个, 十亿分之一
plural of billionth
n. position 1,000,000,000 in a countable series of things
s. the ordinal number of one billion in counting order
n. position 1,000,000,000 in a countable series of things
s. the ordinal number of one billion in counting order