Throughout history, they have flip-flopped between different definitions, wreaking havoc on the names of numbers.
在历史上，他们在billion不同的定义之间已经不断转换多次了，严重破坏了这一数字的命名。
3
We flip-flopped back and forth, thinking on numerous occasions that at last we'd made a decision, only to change our minds again an hour or a day later.