【英语词汇】辨析： for sale / on sale
✔️ 𝗳𝗼𝗿 𝘀𝗮𝗹𝗲 = (正在) 出售
✔️ 𝗼𝗻 𝘀𝗮𝗹𝗲 = (打折) 促销

e.g.: The house is no longer 𝗳𝗼𝗿 𝘀𝗮𝗹𝗲. It was bought two days ago.
这套房两天前售出，现已不再出售。
e.g.: Normally, bananas are 79 cents per pound, but they're now 𝗼𝗻 𝘀𝗮𝗹𝗲 for 49 cents per pound.
平时香蕉售价每磅79美分，现在促销49美分。