a series of

a series of 是a series of factors还是a series of reasons a series of a serious of 区别 the last of a series of competitions a series of ,后面加什么词 a series of books翻译成中文 用a series of造句,急用! set down a series of的意思 a series a series a series a series of和a trail of的区别 a series of后是不是可以跟可数复数名词,也可以跟不可数名词?a series of development a series of books 英语this pulishing house is designing 空school textbooks填of a series of 还是a new series of ,为什么 a series of后 +可数还是不可数啊 Between us,why there is a series of problems? 用 a series of 造句必须有中文翻译 请言简意赅地翻译：a series of deafening explosions