数以亿计的；亿万...

Biological systems have been doing this for billions of years.生物系统亿万年来一直都是这样。Billions of pounds are riding on the outcome of the election.几十亿英镑都取决于这次选举的结果。Israel accepted billions of dollars in war reparations.以色列得到了几十亿美...

billions of的音标：...