at the sale和be on sale 的区别是什么?

没有at the sale
be for 'sale
available to be bought, especially from the owner待售；﹙尤指从主人手中﹚供出售:
I’m sorry, it’s not for sale.
抱歉,这个不卖.
They’ve put their house up for sale.
他们已将自己的房子出售.

be on 'sale
available to be bought, especially in a shop/store ﹙尤指在商店﹚出售,上市:
Tickets are on sale from the booking office.
售票处正在售票.
The new model goes on sale next month.
新款下月上市.