billion 与 billion of的区别
billion 与 billion of的区别
million billion trillion的区别
million billion区别
“seven billion billion billion”是什么意思?
a billion million与a million billion 一样吗
the bottom billion 的意思~
million billion
Billion是什么意思?
billion是什么意思
The population of China is 1.3 billion.
hundred thousand million billion 的序数词!
billion的意思是亿还是十亿?