okok云-
补充楼上的，区别：
sell及物动词，又是不及物动词，也可作名字，通常用来做谓语。短语，sell up卖光，sell to 说服（某人）接受或采用，sell-off 处理存货、证券的跌价，sell out 卖完。
例句：
1. The deal was seen as a union sell-out to management. 这项协议被视为工会背叛己方，投向资方。
来自《简明英汉词典》
2. Investors are set to make a killing from the sell-off. 投资者准备清仓以便大赚一笔。
来自《简明英汉词典》
3. Do not sell on any account until further advice. 在另行通知前切勿出售。
来自《简明英汉词典》
4. You cannot sell the cow and sup the milk. 不能既想卖乳牛，又想喝牛奶。
来自《简明英汉词典》
5. My father commissioned a real estate agent to sell our house. 我父亲委托了一名房地产经纪人来卖我们的房子。
sale是名字，通常搭配定语和介词修饰。短语，on sale出售，for sale 出售，big sale 大甩卖。
例句：
1. The sale netted a fat profit for the company. 这次销售为公司赚得了丰厚的利润。
来自《简明英汉词典》
2. The money was raised by the sale of raffle tickets. 这笔款子是通过出售购物彩券筹集的。
来自《简明英汉词典》
3. How long has that house been up for sale? 那房子提出变卖已多久了？
来自《简明英汉词典》
4. There"s no sale for cotton dresses in the autumn. 在秋季，棉布服装没有销路。
来自《简明英汉词典》
5. There are some nice apples on sale in that shop. 那家商店有些很好的苹果出售。
来自《简明英汉词典》
6. This ten-dollar hat is now on sale for five. 十美元一顶的帽子现在减价卖五美元。
来自《简明英汉词典》
7. Have those things for the jumble sale been looked out yet? 作旧杂货拍卖的那些东西已找出来了吗？
来自《简明英汉词典》
8. This shirt was a bargain — only ￡15 in a sale. 这件衬衫是便宜货，大减价时只卖十五英镑。
来自《简明英汉词典》
9. His entire collection will come under the hammer at next week"s sale. 他的全部收藏品将在下周的拍卖会上被拍卖。
来自《简明英汉词典》
10. The government has imposed a ban on the sale of handguns. 政府下令禁止出售手枪。
来自《简明英汉词典》
11. He got $100 from the sale of his bike. 他将自行车卖掉，得了100美元。
来自《简明英汉词典》
12. He used a certain amount of craft to make the sale. 他为这次买卖使了些手腕。
来自《简明英汉词典》
13. All the shops on the seafront had crab for sale. 海滨地区的全部商店都出售蟹。
来自《简明英汉词典》
14. The net profit from the sale was 100 dollars. 销售的纯利润是100美元。
来自《简明英汉词典》
15. I got this hat on sale; it was very cheap. 我在大减价时买到这顶帽子，价格很便宜。
来自《简明英汉词典》
16. The sale of ice cream is partly determined by the weather. 冰淇淋的销量部分取决于天气。
来自《简明英汉词典》
17. The proceeds from the sale will be used to repay the loan. 销售所得将用来偿还贷款。
来自《简明英汉词典》
18. This store always has a marvellous New Year"s sale. 这家商店新年前后销售情况极好。
来自《简明英汉词典》
19. I will volunteer my daughters for helping the church sale. 我会使自己的女儿自愿帮助教堂出售东西。
来自《简明英汉词典》
20. Have you any unwanted articles for the jumble sale? 你可有用不着的东西拿去当旧杂货拍卖吗？
来自《简明英汉词典》
nicehost-
你好：
on sell,翻译为正在出售。
on sale翻译为正在甩卖，正在打折低价销售、也就是常见的大甩卖
其他的区别就是字义了，容易区分。
谢谢。
可可-
sell是动词，sale是名词