If you buy a $5 sandwich,you'll get the second one at $2.50 or less than $2.50.

If you buy a $5 sandwich,you'll get the second one at $2.50 or less than $2.50.
If you buy a $5 sandwich,you'll get the second one at $2.50 or less than $2.50.

If you buy a $5 sandwich,you'll get the second one at $2.50 or less than $2.50.
如果你买了一个5美圆的三明治,那么你在买第二个的时候只需要花费2.5美圆或更少

如果你买一个5美元的三明治,你就可以以2.5美元或低于2.5美元的价格再买一个三明治.

第一个三明治5美元, 再买可享受五折甚至更高折扣.