Billionth
num. 第十亿个, 十亿分之一
🗣️ 情景例句
I am studying two majors, and it's quite a burden on my time.
我有两门主修课，这占据了我很大一部分时间。
Check it to my final destination
把它托运到我的目的地。
Lake Baikal is the deepest of all the lakes in the world.
贝加儿湖是世界上最深的湖泊。