得了第一,是come first还是come the first

得了第一,是come first还是come the first 得第一是come first还是come the first Co-first 请问Co-first Author是指第一作者吗? come first还是come in first? let the girl come in____(one)填first的话,翻译是让那个女孩先进来还是让那个女孩成为第一?或者不是first?另求考点, 是Study must come first对?还是Study must come the first对?为什么? 口语中第一,第二是first,second?还是firstly,secondly? 一氧化碳是CO还是Co? come first / come the first 哪个对?意思是? She is the first one to --(l来到) to school.这里是写come 还是get 英语作文开头中“首先,第一”是用“First,”还是“At first,我记得好像不能用“First,”开头,只能用“At first, come first表示得了第一,与此类推是不是还可以有come second,come third?请谨慎回答!牛津高阶英汉双解词典第7版P385例句：She came second in the exam.她这次考试名列第二。这么说前两个都可以，那come thi first come,first served. first come first served first -come- first -severd First come first served.中的“SEVED”是啥意思? 我写一段英语演讲词,要写到第一站是用first station还是the first station作为开头出现 高手COME ON!Fe2O3+3CO=2Fe+3CO2这里Fe2O3是氧化剂还是Fe3+是氧化剂?