急：per day 与 every day 有何区别?

急：per day 与 every day 有何区别? twice a day是否等于twice per day 能说twice every day Most students da homework every day.就do homework提问 英语作文 是every your da y 还是 your every day如题 every single day与every day什么区别呀? come to school __time every day急 1% per day Shifts Worked per Day every day与everyday；every one与everyone的区别 everyday与every day的区别 every day与these days的区别 every day与everyday的区别 everyday与every day 有什么不同? everyday 与every day 的区别? every day与everyday有何区别? every day与everyday的区别 per和every的区别 every two days与every other day是什么时意思