Billions
n. 十亿（billion的复数形式）
🗣️ 情景例句
It is.
正是。
He spends a lot of time reading books on ecology.
他花了大量的时间阅读生态学方面的书籍。
Dan wondered why he was wanted by the police, but he went to the station yesterday and now he is not worried anymore.
丹奇怪警察为什么找他，但昨天还是去了，结果他一再担心了。