Tennis is open all day long.中的all day long在句中充当什么词性?

Tennis is open all day long.中的all day long在句中充当什么词性? all day (long) all day和all day long有什么区别 all day long 的用法 It goes all day long. all day long和ALL YEAR ROUND中的LONG和ROUND是什么作用,用法? all day time和all day long的区别 all day 与 all day long的区别 all day和all day long的区别? all day 和 all day long 的区别? Jack is very tired,he____the house all day long U_____ ,it rained all day long .