a third与one third 有什么异同

a third与one third 有什么异同 one ...another...a third...还是the third one third one third one third a third a third one and a third billion是什么意思? a third one和the second “one...another...a third”中文是什么? a third和the third有什么区别 17.The room is about__in diameter as the hall.a:one-third as large b:as one-third largec:as large one-third d:one-third large as one third of one-third of z one- third less than a+序数词+time与the+序数词+time有什么区别?就如a third time与 the third time. 英语数词的写法什么时候带“-”one-third one third 有什么区别? one third 中间有-吗为什么有些写法是one-third ,到底哪个对?