(1)for sale 表示“待售;供出售(尤指从主人手里)”。例如:
House for sale. (This house is for sale.)
此房出售。
(2)on sale 表示“在出售;大减价”。例如:
These clothes are on sale.
这些衣服减价出售。
The watch is only 50 dollars now. It is _______.
sell
on sale
for sale