half invitation and half forcing 求翻译

什么是“half and half” half open fields and half half and half 什么意思? four and one half meters 怎么翻译? 10 and a half feets 翻译 five and a half million 怎么翻译 翻译：a billion and half dollars half One and half years___passed求大神帮助 My mother and a half-brother and two half- sisters 谁能翻译下意思 half of them and a half If was half in and half